Average - Quantitative Aptitude (MCQ) questions for Q. 780

Q.  If from a group of 5 people, an old member is replaced by a new one, the average age is same as it was 3 years ago. What is the difference between the ages of the old member and the new one?
- Published on 06 Jul 15

a. 12
b. 15
c. 11
d. 18

ANSWER: 15
 
The present average age is (x + 3) when the old member is present and it equals to x when an old member is replaced by a new one.
The difference in the ages of the old member and the new one is equal to the difference in the total age before and after the replacement = 15 years.

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