Correct Answers: | |
Wrong Answers: | |
Unattempted: |
Question 1
If 82 is m% of p, and B is p% of m, then what is B?
Question 2
A number is first increased by 60%, and thereafter it is reduced by 60% again. What is the overall reduction?
36 %.
38 %.
34 %.
40 %.
Ans: a
Let us derive the shortcut formula first, so that you can remember it and use it when the need arises. Suppose the number is 100, and let the increase be x%. The number becomes 100 + x. When it is reduced by x%, we get 100 + x - $((100 + x) × x)/100$ = 100 + x - $(x + x^2/100)$ = 100 - $x^2/100$, hence a reduction of $x^2/100$ = 36%
Question 3
If 20% of X is Y, then Y% of 20 is?
Question 4
A carton contains 3000 led bulbs, some of them are red, some green and others are blue. How many are green if 9% are red and 5% are blue?
Question 5
A number is first increased by 80%. By what percent must it be reduced so as to restore it to its previous value?
$44{4/9}$ %.
$51{1/8}$ %.
$35{6/11}$ %.
$38{9/11}$ %.
Ans: a
Let us derive the shortcut formula first, so that you can remember it and use it when the need arises. Suppose the number is 100, and let the increase be x%. The number becomes 100 + x. Let us suppose that it has to be reduced by p% to restore it to 100. Then, (100 + x) - p × $(100 + x)/100$ = 100. We can cancel away 100, and easily simplify it to p = ${100 × x}/{100 + x}$ = ${100 × 80}/{100 + 80}$ = ${400/9}$, which is same as: $44{4/9}$%.
More Chapters | See All...
HCF and LCM | Inequalities | Analogies | Ranking Test | Surds and Indices | Matrix Test | Coding Decoding | Logarithms | Data Sufficiency | Problems on Trains | More...
This Blog Post/Article "Percentages Quiz Set 001" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2020-02-07. Published on: 2016-05-12