L-23 - NIPER JEE 2026 | Organic Chemistry: Ratio & Proportion | 360 Series #niper #Ratio #proportion

Added: 2026-05-17

[00:00:00]Hello students, welcome back to GDC. Today we are going to talk about Sniper 2026 360 series in which today we will do some previous year questions which will be related to ratio and proportion.

[00:00:13]So let's see what we've come up with for question number one.

[00:00:15]Which is our number one question. In question number one we are given that the ratio of the number of girls to boys in a school of 360 students is 335.

[00:00:29]How many children are there in a school? There are 360 ​​students. Out of which the ratio of girls to boys given is 335.

[00:00:38]What does it mean? Girls to Boys means Girl Upon Boy. It means our 33 are our girls. And our 35 is our boys. Ok?

[00:00:50]How many total students are there in a school?

[00:00:53]3060. Out of which the ratio of girls and boys is given as 33 and 35.

[00:00:58]So now we have to tell how many more girls should be admitted to make the ratio 1. So now we have to tell how many more girls should we add so that the ratio becomes 1. Ok?

[00:01:15]How many more girls should we add so that our ratio of 33:35 changes? There should be a change in 1. So what do we do with this type of question? Now we know the ratio of girls and boys.

[00:01:30]So we can say that the girls to boys ratio is 33 and 35, it means this is your 33x and this is your 35x.

[00:01:42]So now we will see if we find out what is the total number of girls?

[00:01:46]What is the total number of boys? So we can see on that basis. Ok? So there you have it, 33x + 35x = is equal to what?

[00:01:59]Equal to 3060. Because what is the total number of girls and boys?

[00:02:04]Is 3060. And their ratio was given as 33 and 35.

[00:02:07]Ok? So it will be 8. This will become 98x = 3060. How much is ours? 98x = 30 360 5 and 38 336. Ok? How much will it be?

[00:02:24]68x = 3080 so whatever comes out to be our x, it will be our 45, what will be the value of x that comes out to be ours? 45 will come. So now let us see what will be the total number of girls? 33 * 45 and what will be the total number of boys? 35 * 45 this will be 33 * 45 and 35 * 45 so the total number of girls who will come from you will be 1485 and the total number of boys who will come from us will be 1575 1575 so the number of boys is this much. This is the number of girls.

[00:03:04]So if I subtract the number of girls from the number of boys and the number of boys. It means if we do it 1575 - 1485 then we will know how many more girls we need so that our ratio becomes 1.

[00:03:20]Ok? So how much will this cost? 90 It Means How Much Do We Need? 90 more girls are needed so that the ratio becomes 1.

[00:03:29]How can that happen now? Like 90, this is what Girls Upon Boys will do. How much will this be? How many boys are given? 7 1575 and how many girls will there be, our 1485 plus how many 90, so how much will it be, 175, what does it mean, it will become 1 / 1, it means 1, so what will we get, our answer has come, okay, what was given, the total number of students was given, the ratio of boys and girls was given, with its help, what did we find out, we found out our boys and girls. Now see, our number of boys is 1575, it means, and our number of girls is 1485, so we will have to add the number in it.

[00:04:08]How much will you add? If we add 90, it will become equal to this. And what will come when we divide from each other? 1:1 will come. So our option number one is complete. Now let's move ahead.

[00:04:20]If we talk further, its complete explanation is given here. Now let's move on to question number two.

[00:04:26]What is given in question number two is that a b = 3 4 and b c = 5 7 and c d = 8 9 so we have to tell a d directly what will we do it means we have to tell a / d so how much will this be a / b * b / c * c / d this will be your how much 3 / 4 * 5 / 7 * 8 / 9 ok this will be 3 * 3 = 9 this will be 4 * 2 = 8 so how much will this be?

[00:05:01]How much will 15/21 be? 5 * 2 = 10 sorry 10 / 21 so what is your ratio? 10 21 So option number B will be our correct option for question number two. What if you are given?

[00:05:12]a b minus b c minus c d, so what shortcut will you use, that if we have to find a/d then we will multiply a/b/c/d with each other.

[00:05:22]Our answer will come which we have to find out. Let us now move forward to the next question. Next is our complete explanation given here. It means the explanation has been given in a bit broad way but what we have solved has been solved through a very shortcut method. Now let's move ahead. What is given in question number three? Two numbers are in the ratio. There are two numbers. In what ratio? It is in 7:1. If 7 is added to each of the numbers. If seven is added to each number, then we have to tell the ratio becomes 2:3, the ratio becomes how much it changes into 2 3, so we have to tell the smaller number, what will be the smaller number, what is in the question, there are two numbers whose ratio is 7 11, now seven is added to both of them, so the ratio becomes this, now we have two numbers, if I assume a and b, it means 7 11, then what is this 7x and what is this your 11x, what is 11x.

[00:06:22]Ok? Now what did we add to both the numbers? So it means 7x + 7 / 11x + 11 is equal to what? That will be our 2/3 i.e. 2 equals 3. It means 2/3 will be ours. What will we do? We will cross multiply. If we cross multiply it, how much will it become? 21x + 7 * 3 = 21 = 11 * 2 = 22x + 7 * 2 = 14 Now if we solve this then this will come out to be x and how much will this be, we will take it here and if we take it here then the value of x that will come out will be your seven, how much will the value of x come out, your seven will come out and what do I want to tell you, the smaller number, if we look at these two numbers then which one do you see as smaller, 7x 6 then how much will this be? 7 * 7 means 49 which is our answer, how much did we get? 49 Answers have come. Option number B will be our correct option for question number three.

[00:07:20]Let us now move forward to question number four. Its complete explanation has also been given here.

[00:07:27]If we talk about question number four. What is the ratio between the third proportional of 12 and 30 and the mean proportional of 9 and 25? Meaning what was given? If we talk about third proportion then its formula will be c = b² / a three proportion means we have three numbers a b c so if we find the third proportion then it will be c = b² / a and if we talk about mean this is your third proportion for whom for the third proportion and if we talk about mean then ab what is our mean what is mean proportion okay what is our mean now we will directly put the value in it. So how much will this be? If we take out c, what is c equal to? Given that 12 and 30, it means this is your a and this is your b.

[00:08:21]It means how much will this cost you? It becomes 30 * 30 / 12. And if we talk about Pisces, what will become of our Pisces?

[00:08:30]9 * 25 Because who is this for you? It is for Pisces. And who is this for you? These are given for the third proportion. Ok?

[00:08:40]For whom are they given? These are given for the third proportion. When you solve this, how much will it cost you? How much will 75 cost? 75 will come. This will be your 75.

[00:08:52]This will become 2 * 6 = 12, 2 * 1 = 2, 2 * 5 = 10 ok? This will become ah 3 * 2 = 6 and this will become 3 * 5 = 15 this will become 2 * 1 = 2 2 * 5 = 10 so 5 * 5 = 25 2 5 * 1 = 5 6 75 how much will this be this will come out of the root this will become three this will come out to be three this will become five so this will become your 15 so now what we have to find is the ratio of the third proportion and the mean so the mean third proportion is this mean this is this mean how much will your 75 / 15 be how much will your 75 / 15 be. 15 * 5 = 75 5 / 1 it means 5 1 your answer will come. Option number B will be your correct one.

[00:09:39]This will be our full use for mean proportion and this will be our use for sorry third proportion and this will be our use for mean proportion. Ok? Phula. If you keep these flowers set well in your mind. Ok? So your answer will come easily. Now let's move on to the next question which is question number five. If we talk about question number fifth, our two numbers are true, their ratio is 4:7. How much is it? It is 4:7. If each is increased by 4 what to do now?

[00:10:09]Each number was increased by four. So this is the ratio.

[00:10:13]It means one is our 4x. Plus what in that? Added four. One is our 7x.

[00:10:18]What did you add to this also? Four. So what is your ratio? It became 3/5. If we cross multiply then 5 * 4 = 20 x + 20 = 7 * 3 = 21 x + what is it? 12 is ours, this will be x and how much will this be for you? It will come at 8. So what is the value of x? It has come at. If we talk about larger numbers, then which is our larger number among 4 and 7? is 7x. So how much will this be? 7 * 8 means 7 * 8 = 56 so option number C will be our correct option for question number fifth. Ok? Let us now move on to the next question. On to question number six. If we talk about question number six.

[00:10:58]The Ratio of Two Numbers Given x and y are two numbers. Their ratio is given by yours 4:7 if 6 is added to x and se is subtracted from y. Meaning we have two numbers. One is x, one is y. So what was said? The numerator of x and y is our x.

[00:11:19]How much did we add to x? If we subtract -7 from 6 and y, what is your ratio? It became 3/4.

[00:11:27]So you have to tell the difference between x and y. We will cross multiply.

[00:11:32]Ok? What to do? What else is given? The two numbers x and y are equal to what? 4/7 of. Who is he equal to?

[00:11:39]4/7 of. So it means x / x / y = 4 / 7. So from here, what can we say that x is equal to? 4 / 7 is equal to y.

[00:11:48]This is what is happening directly here. What is happening to us now? 4x plus how much is this getting you? 4x + 6 * 4 = 24 = 3y - 7 * 3 = 21 ok? How much is it?

[00:12:04]A 3y - 21. What can we replace now? You can replace the values.

[00:12:10]How much is this? What is 4 * 4 / 7y + 24 = 3y - 21? 3y = 21 3y = 21. Ok? We write it down nicely. This is yours 21. Ok?

[00:12:30]So how much will it be? 16y + 7 * 4 = 28 2 7 * 2 = 14 15 168 equals to what will it be, it will be multiplied here also 7 * 3 = 21y + 7 * 1 = 7 and 7 * 2 = 14 what is your minus here so how much will it be 14 7 21y 168 and this is your 16y now we will solve it further when we solve it further what will we do what will be your minus 21?

[00:13:04]21 minus what will happen to you?

[00:13:08]y - 16y = This becomes 168 + 147, so how much will it be? It will be 5 years. How much will this be? 7 + 8 this will become 5 one carry 7 4 12 and one this will become your 7 plus 7 4 10 11 one and this will become two and this will become three so y = 5 * 6 = 30 and 5 * 3 = 15 so what is your y 63 and what is your x 4 / 7y it means 4 / 7 * 63 so 7 * 9 = 63 9 * 4 = 36 so what is your value of x? What is the value of 36 and y? 63. What do you want to tell?

[00:13:54]We have to tell the difference between y and x. So if you do y - x, how much will you get?

[00:13:59]How much will your 63 minus be? It will become 36.

[00:14:02]And if we subtract this, how much will it be? 27.

[00:14:05]It means your option number D will be correct.

[00:14:08]For question number six. There were two numbers.

[00:14:10]Their ratio was given. x / y was equal to 4 / 7. The number six was added to x. In y we subtracted seven numbers. Ok? We subtracted and what was it equal to? Their ratio was becoming equal to 3/4. We did As It Is.

[00:14:24]After that cross multiply it.

[00:14:26]Solved the equations. Find out the value of x.

[00:14:29]Find out the value of y.

[00:14:30]We had to find the difference of y. And what happened to us when we found out the difference of x? 27 Our answer has come. Ok?

[00:14:38]Let's move ahead now. Next is our question number seven, if we talk about it, what is given? Is in a school having role strength 286 the ratio of boys and girls is 8:5 if 22 more girls get admitted into the school the ratio of boys and girls becomes So what do we have to find out first in this question?

[00:15:02]We have been given the strength of the school children and the ratio of boys and girls has been given.

[00:15:09]Meaning, who got eight? of the boys. And who got five? It's about the girls. So if we talk about the total, what will 8x + 5x be equal to? Will be equal to 286. It's a simple matter. Whose equal will it be? Of 286. So 8 5 13 this will become 13x = 286 so x = 286 / 13 13 * 2 = 26 this will be how much you have?

[00:15:32]22 will come. From here 26 and 26 will become 22, so what is the value of x? 22. If we talk about girls, how many girls do we have? 8 5x so this will be our 5 * how much will it be 22 so 5 * 2 = 10 1 5 * 2 = 10 and how many girls and boys will we have 110, how many boys do we have 8 x it means 8 * 22 it means 8 * 2 = 16 176 now what has been said that how many more did we add to the girls, 22 girls so 11 1 0 plus what did we do in this 22 will become 2 1 3 2 girls.

[00:16:13]So if we find the ratio of girls to boys, whose ratio is asked?

[00:16:18]Yes boys to girls so it will be b/y. Whoever is asked is on top. Ok? Boys to girls so b/g equals to how much? How many boys do we have? 176 and how many girls are there? 132. Ok? What will we do with them? Will cancel out from common number.

[00:16:37]So how much will we lose?

[00:16:41]2 * 8 = 16 2 * 8 = 16 2 6 12 and 2 * 6 = 12 11 * 8 11 * 6 ok? So it will be 2 * 4 and 2 * 3 it means 4 / 3 it means 4 3 our answer is out, option number D will be our correct one for question number seven.

[00:17:02]Ok? Now let's move forward to the next question. If we talk about question number eight.

[00:17:10]What is given in question number eight? We have two numbers.

[00:17:11]One of those numbers is 20% more than the third number. And the second number is 50% more than what? From the third number.

[00:17:19]So now we have to tell what is the ratio of those two numbers? Ok?

[00:17:25]What is the first number?

[00:17:27]Who has 20% more? Third number one. And what is the second number? It is 50% more.

[00:17:33]With whom?

[00:17:35]From your third number. So how much will this be?

[00:17:37]1.25x is how much? 1.5y is okay?

[00:17:41]1.2x and 1.2 become 1.5y. When we calculate their ratio, it will become 12 / 15. This means 3 * 4 = 12 and 3 * 5 = 15. This means 4 / 5. This means 4:5. So option number A will be our correct option for question number 8. Ok? Now let's move ahead. If we talk about the next question, then our next question is our question number nine. If we talk about question number nine, what have we been given? A B Ratio is given AB is 5:9 BC.

[00:18:15]So we have to tell A B C. This is a very easy question. We are going to tell you a very short method.

[00:18:20]What will happen? If we are given A B.

[00:18:23]We have to find A B C. So how much is A B? 5:9 So how much more is given? BC means 74 is given. If this is not there then what will happen to this also?

[00:18:37]9 is 7, so what will this be? So this will become 7 * 5 = 35 this will become 7 * 9 = 63 and this will become 9 * 4 = 36 so option number A will be our correct option for question number nine. If you are given the question a b c and you are asked a b c then you will directly apply this shortcut method and your answer will come. Now let us move ahead to question number 10. If we talk about question number 10. The ratio of red marbles to blue marbles in a jar is 3:5, which is the ratio of blue marbles and red marbles given the meaning of red to blue, which is 3:7. It means if we talk about three, [sound of clearing throat] what is this going to be for us? Speaking of three, what will this be of ours? It will be red. Our raid will be three.

[00:19:29]Our raid will be three. And the one with seven will be our Blue. Ok? Red to Blue, right?

[00:19:35]After that it is said if there are 24 red marbles. If there are 24 red marbles, what does it mean 3x is equal to?

[00:19:43]What is the value of x = 3 * 8 = 24, since 24 is At. So tell us how many Blue Marbles are there?

[00:19:48]How much are Blue Blue marbles? 7x it means 7 * 8 it means 7 * 8 = 56. So option number C will be our correct option for question number 10.

[00:19:58]Ok? Now let's move ahead. If we talk further about question number 10. The ratio of red marbles to blue marbles in a jar is 37 which is proportional to blue marbles sorry this is the same question our question number 11 what is in question number 11 we have to divide ₹300 by 2% the ratio given is 2:3 so how many does each person get? So we have to tell how much money each person will get. If the ratio of people given is 2:3, then two persons are given and ₹300 has to be divided between them. What do they have to do? ₹300 has to be divided among them.

[00:20:39]So how much money will they get? We have to tell this. Ok? If we assumed that a b was given how much? 2:3 What will be their total? It will be five. So if we take out for A, 2/5 is how much? 300 will become 5 * 6 = 30 It means ₹120 will come and how much will come to B? 3 / 5 * 300 It means 5 * 6 = 30 3 * 6 = 18 It means ₹10 So one will get 120 and the other will get 180 Option number B will be our correct one for question number 11. Now let's talk about the next question. Next is our question number 12. The ratio of incomes of A and B is 4:5. The ratio of income of A and B is given as 4:5 and their expenditures are in the ratio 3:4.

[00:21:29]Their expenditure is also given as 3:4. If both save, how much will they earn? If both are saving ₹1000, then we have to tell them how much their income will be.

[00:21:37]Now we know what our expenditure is? What will our [sound of clearing throat] expenditure be equal to? It will be equal to income minus savings. This will be income minus savings. So now we have to tell what else has been given? The ratio of income and whose?

[00:22:01]Income and their expenditure are given in this form. So what will happen to us directly? What will happen to us? So how much of our 4x - 4x - 1000 do we have? What is 5x -000 equal to? Will be equal to 4/5.

[00:22:22]Sorry how much? Will be equal to 3/4. Because what is the expenditure in ratio? 3:4 K. What else has been said? If that income and income ratio is given a b and how much of it is being saved? It is ₹1000, so what did we do, income minus saving, income minus saving is equal to what will be expenditure equal to, means it will be equal to 3/4, if we cross multiply then it will become 16x - 4000 = 3 * 5 = 15x - 3000, how much will it become, it will become 3000, now if we take it there then how much will it become, 1000 equal to, if we bring it here it will become x, so what is the value of x, you have got 1000, now what do we have to tell? His income has to be disclosed.

[00:23:09]So how much does A have? What is the sum of 4x and A?

[00:23:12]5x it means it will become 4000. How many more will we have? The income will be Rs 5000. So 4000 and 5000 means option number A will be our correct option for question number 12. Now let's move forward to the next question. Next is our question number 13. If we talk about question number 13, what do we have to do to divide ₹1260 among A B and C? ₹1260 has to be distributed among A, B and C. Their ratio is given as 2:3 4. So now we have to tell how much each one will get? So you all know that if we talk about each one, then as we had just solved for A B, which was the first question before this, I think question number 11, we did the same in that also. We are going to do the same in this also.

[00:23:56]What have we been given? a b c means the ratio of three has been given, so this will be how much is a b c, ours is 2 3 4, okay, after this this is ours, now how much will it be for us, if we talk about the total, if we see then how much is this 2x 3x and this 4x, in a way what is the total, 4 and 3 7 and 2 9 9x is their total, okay or we can say nine is the total, so now if we calculate for a then how much will it be 2 / 9 * how much total income has been given? 1260 is okay? So how much will this be? 3 * 3 = 9 3 * 4 = 12 And this will become 3 * 4 = 12, 3 * 2 = 6, 3 0 = 0 3 * 1 = 3, 3 * 4 = 12 0 So this will become 2 * 140, 2 * 0 = 0, 2 6 2 * 4 = 8 and 2 * 1 = 2 How much did it come? A has 280, how much will it be if we talk about B? 3 * 1 4 0 3 0 = 0 3 * 4 = 12 3 * 1 = 3 And how much will this six be? 3 * 1 = 3 and one this will become four sorry 42 0 and if we talk about C then this will become our 4 * 1 0 it means 0 4 * 4 = 16 1 4 * 1 = 4 and one what will be this 5? 560 So we are seeing option number A which is correct which is matching for our A, B and C.

[00:25:21]So how much did A B C cost? 280, 420 and we got 560.

[00:25:26]Now let us move ahead to question number 14.

[00:25:29]If we talk about question number 14. Two numbers are in the ratio 3 4.

[00:25:34]What ratio are the two numbers in? 3 is in 4. If at is added to both. If eight is added to both of these, three and this. It means how much will this cost us? What is 3x + 8 / 4x + 8 equal to? Equal to 4/5. We will cross multiply. This will become 15x + 8 * 5 = 40 = 16x + what will it be equal to? 16 of. If this goes here, our x equals to 40 - 16, so what will x be? Out of 10, 6 will go, four will be ours and how much is left here? One out of three went two. So what is the value of x? 24. Now we have to tell them their numbers. So how much is it?

[00:26:11]How much will 3 * 24 become? 4 * 24 so 3 * 4 = 12 1 3 * 2 = 6 and one will be how much?

[00:26:19]7 3 * 2 = 6 And how much will this be yours? It will become 7. 3x + 4x + 8 sorry what do we have here? It is eight because 72 is not ours. So it means we have made a mistake somewhere.

[00:26:32]What mistake did we make? We had to add at.

[00:26:34]But how much did we add here? Four. So here also 8 will come. So our mistake was here. Ok? So we have to correct this. If you correct it, how much will it become? This will become 15x + 40 = 16x + 8 * 4 = 32 so x will become this will be how much x is ours and this will be ours what x will come in minus and how much will this be ours 8 is not correct it will come 8 only, okay how much is ours coming 8 is coming this way and if we take it here then our 8 it will come 3x this will become 4x it means 3 * 8 and this will go 4 * 8 so 8 * 1 = 8 * 2 = 16 8 * 3 = 24 now see 24 is coming so this option number will be correct.

[00:27:20]What will be the second number? 8 * 4 = 32 Option number A is our correct option for question number 14.

[00:27:24]Now let's move ahead. Next is question number 15. What do we have to remove?

[00:27:29]a b is given. b c and cd are given.

[00:27:33]We have to find out a b c d. So if we take out a b c d then we will put it directly. This is 2 3, this is our 45 and this is our 67, this will be your five, this will be five, five will come here, just like we calculate A B C, we have to do the same in the same way, here we did not have C, D was not there, so we will take the one which is nearer to these, its nearer is three, so three will go here also, now its nearer here is five, so five is its nearer, what is four here, how much will come here, six, so how much will come here, six and here also six here. Ok?

[00:28:13]What will we do now? We will multiply these among ourselves.

[00:28:15]This will become 2 * 4 * 6 3 * 4 * 6 3 * 5 * 6 3 * 5 * 7 Here we go. Ok?

[00:28:31]6 * 2 = 12 Let us first check here whether something is getting cancelled or not. It went from three to three. This three goes, this goes and this will become 3 * 2 = 6. So this will become 16 ratio, this will become 5 6 * 4 = 24, this will become 5 * 6 = 30 and this will become 7 * 5 = 35, now something is getting cancelled, if not then our answer number A will be correct, for question number 15th, what we have to do simply is multiply it like this, okay in each one and our answer will come. Let us now move ahead to question number 16. If we talk about question number 16, in question number 16 we have been given a b which is 3 4 what do we have to find out a² + b² a² - b² so how much will this be for us a / b = 9 / 4 simply we write this down first, how much is our a b 3 4 what do we have to find out a² + b² and a² - b² okay what will happen here a is this b is this so 3 * 3 = 9 + 16 here it will be 9 - 16 this will be ours. Ok? This will be your 25, this will be our minus 7, it means when you find their ratio a² + b² / a² - b² it means 25 / -7 it means 25 -7, so option number B will be our correct one for question number 16th. Now let's move ahead. Next is our question number 17, if we talk about it then there are two numbers given in the ratio 7:9, what is their LCM, if it is 630 630 then we have to tell what will be the number, it will be simply 7x * 9x = 63 0 then x² = 7 * 9 = 63 and this will become 9 * 1 = 9 it means how much will this become, it will become 10.

[00:30:28]Ok? How much will it cost you? It will become 10.

[00:30:31]x10 is yours sorry 7x 7 ah 7 * 9 = 63 10 70 and how much is this yours?

[00:30:44]If we look at the options, then your zero is missing here. How much is there here? Zero misses are missing. This is 6300. This is 6300. So let us take 1 minute to check its questions.

[00:31:09]Ok? This is our LCM. So if there is LCM then what will happen to us directly? If there is LCM then what will happen to us directly? 1 minute.

[00:31:19]We will come here.

[00:31:22]The ratio of two numbers is this much if their LCM is 630 then one will be 7, one 9 and one x, so what will we do directly, 63 0 / 63 will become 7 * 9 = 63, our 10 came, now 10 will be added to which, it will be multiplied, so it will also be 7 * 10 and what will be our second 9 * 10, it means what will be 7 * 10 = 70 and this will become 9 * 10 = 90, so 70 and 90 it means option number B will be ours. Ok? Our option number will be B. If it is in ratio then we take x. So 7 and 9 means one is this, one is that and one is one.

[00:32:02]Ok? Yes. If 3 and 2 equals 6, right?

[00:32:05]What will happen to our 63/? 630 / 63 = 10 It means 7 * 10 and 9 * 10 Because these two numbers are in what? It is in our ratio. Let's move ahead now. Moving on to question number 18.

[00:32:17]And if we talk about question number 18, this is also very simple. Given a + b we will cross multiply 5 / 1 / Given a - b.

[00:32:26]a + b = 5a - 5b will be ours and how much will this be ours? If we move this over here, this will become 4a and this will become 6b. It means what will a / b become? 2 * 2 = 4 2 * 3 = 6 It means 3/2 It means a what will b become? 3 2 So option number B will be our correct option for question number 18. Now let's move forward to the next question. Next is our question number 19. Given a b = 2 3.

[00:32:56]Given that b c = 4:5. So we need to find out a + b a + c b. What is the plan?

[00:33:05]a + c / What do we need to find out? b to find out. If we look at what we have been given? How much is a b? How much do we have 2 3 and b c? 4:5 means b is common. So what do we have to do? We will have to make b equal.

[00:33:23]Ok? What do we have to do to make it equal?

[00:33:28]Here you will have to multiply by four and here you will have to multiply by three.

[00:33:32]So our 8 will be 3 * 4 = 12 and how much will this be? 4 * 2 = 4 * 3 = 12 5 * 4 = 20 So what is our b? It is common for both of us, if there is something common then it is common.

[00:33:46]What do we have to figure out now? a + b So what we can say here is that if we talk about a b c then what is this? 8 12 20 happened. What do we have to figure out now? a + c / b it means a how much is yours? What is 8 + c?

[00:34:01]20 / b how much is yours? 12 so this will be 28 / 12 2 * 1 = 2 2 * 6 = 12 2 * 1 = 2 2 * 4 = 8 2 * 6 = 12 2 * 3 = 6 2 * 7 = 14 it means 7 / 3 it means it means 2 * 1 = 2 * 4 = 8 so this is your ah 2 * 1 = 2 2 * 4 = 8 and 14 / 2 * 6 = 12 it means this will be your 2 * 7 = 14 and 2 * 3 = 6 7 3 is coming out. How much are you getting? 7 3 is coming.

[00:34:39]So what will be the correct answer? 7:3 will come. Let's look ahead for a minute.

[00:34:45]So how much will this cost you?

[00:34:47]12 This will be 15 1 minutes. 15 Let's watch it again, let's do it again.

[00:34:53]Ok? How much is it? a b = 2 3. And what do we have?

[00:35:02]Given that bc = 4:5. Ok?

[00:35:05]What do we do now? Here you have to multiply by four. Here you have to multiply by four. Here you have to press three.

[00:35:11]So 4 * 2 = 8 * 4 * 2 = 8 3 4 = 12 What will it be here? 12 3 * 5 = 15 Correcting now. What did we have here? There was change earlier. This will be yours. If we calculate a b c then ours will be 8 12 15. So this will be a + c, how much will our upto b be, it means how much will our upto 8 + 15 be, it will be 12, 8 5 13, this will be 23 / 12, the ratio that will come will be 23 12, so which option number of ours will be correct, our option number a will be correct, its complete explanation is also given here for question number 20, so this was our today's session for NIPER, we have practiced some previous year questions of Ratio and Proportion of 360 series, which is fine, so you should practice from your books, practice the questions so that your preparation can become better and to do better, stay connected with us with GDC. We will bring every new topic for you. Be it any topic, be it your profit and loss or simple and compound interest or your algebra, we will cover everything. You just have to stay with us.

[00:36:32]You have to practice with consistency and discipline and crack your exam. So very all the best for your exams and see you in the next video. Take care. Thank you.