Important Formulae for Quantitative Aptitude

[00:00:00]Hi students kids these are some formulas which you have to keep in mind for the Quantitative Aptitude portion of the exam.

[00:00:06]So now see, if any two numbers are given, their product is equal to the multiplication of HCF * HCF * LCM. So HCF = HCF * LCM = a * b. Ok? First of all, you have to remember this formula. Suppose you are given HCF and asked what are the two numbers? So whatever HCF is given, what will be the two numbers? ax * bx ok? Someone might have given the value of a also.

[00:00:34]He might have also given the value of b.

[00:00:35]So there will be two numbers, what will they be? ax and bx. If you want to find HCF of fractions then you are given two numbers pq like 2 3 4 5 in p over q form. So these became fractions. If you want to find their HCF, then what is the formula for HCF? is the numerator which is p * q of both, right? Find the HCF of p1 * p2. Find the LCM of Q1 and Q2. So HCF of numerator and LCM of denominator. If you apply this one, HCF will come out.

[00:01:06]If you want to find the LCM of these fractions then put the LCM. LCM & HCF of numerators and denominators.

[00:01:12]What is the formula to remember this? What's the trick to remembering it? If fraction K comes. If HCF is asked then HCF will have to be kept. HCF is what you will put on top. Ok? So the numerators will have the numerator above them. The denominator will be below.

[00:01:24]This will definitely be remembered. So if HCF is to be calculated then HCF of numerator over LCM of denominator, if LCM is to be calculated then LCM of numerator over HCF of denominator is the same, so this is it, after this profit loss, you know profit is selling price minus cost price and loss is cost price minus selling price, right after this the child is profit percentage, what is it, profit over CP * 100, from here the profit percentage will come and what about loss percentage will come, loss over CP * 100, after this what is the relation between selling price, cost price and profit percentage?

[00:02:00]Selling price equal to cost price * 1 + profit percentage over 100 Similarly, if there is a loss then in that case selling price = cp * 1 - loss over 100 loss percentage over 100 OK? After this, if the child is given any two successive profits of x percent and y percent. Right now the first profit is being given at x percent. Second, you are being given y percent profit. So the net profit in that case will be x + y + xy over 100, right? Firstly, this is the formula. After this, if any two successive losses have been given. Some give two successive losses. So what is there in that case?

[00:02:38]If there is a x percent loss given a y percent net loss. x + y - xy over 100 if he said that earlier he was making x percent profit.

[00:02:47]Then there is a y percent loss. So what will be the net change in that? x - y - xy over 100 okay? Just pay attention to the sign.

[00:02:56]After this, if we talk about discount, then marked price minus selling price will be the discount. MP has arrived at the marked price. Your question has come from here in the previous year, right? So if we are talking about discount then in that case the formula will be selling price equal to marked price 1 - d over 100, this d will be the discount. After this, if successive discounts are being given then it is okay. If we are talking about first discount, second discount and successive discount then the formula will be d1 + d2 - d1 d2 100. Okay, this is the formula. After this, there are some more flowers too, let us discuss them in the next short.

[00:03:32]Okay.