Exercise :: Percentage  General Questions
 Percentage  Important Formulas
 Percentage  General Questions
6.  If 20% of a = b, then b% of 20 is the same as: 

Answer: Option A Explanation:

7.  In a certain school, 20% of students are below 8 years of age. The number of students above 8 years of age is of the number of students of 8 years of age which is 48. What is the total number of students in the school? 

Answer: Option E Explanation: Let the number of students be x. Then, Number of students above 8 years of age = (100  20)% of x = 80% of x.
x = 100. Video Explanation: https://youtu.be/yPfocU6DA2M 
8.  Two numbers A and B are such that the sum of 5% of A and 4% of B is twothird of the sum of 6% of A and 8% of B. Find the ratio of A : B. 

Answer: Option D Explanation:
Required ratio = 4 : 3 Video Explanation: YouTube Video 
9. 
What is the percentage error in the calculation? 

Answer: Option D Explanation: Let the number be x.

10.  In an election between two candidates, one got 55% of the total valid votes, 20% of the votes were invalid. If the total number of votes was 7500, the number of valid votes that the other candidate got, was: 

Answer: Option A Explanation: Number of valid votes = 80% of 7500 = 6000. Valid votes polled by other candidate = 45% of 6000
