59. After replacing an old member by a new member, it was found that the average age of five numbers of a club is the same as it was 3 years ago. What is the difference between the ages of the replaced and the new member?
A. 2 years B. 4 years C. 8 years D. 15 years
Answer: D.
Explanation:
Age decrease = (5 × 3) years = 15 years.
So, the required difference = 15 years.
