Question

The average age of a husband and wife when a child is born to them is 30 years. What is the difference between the average age of the family 3 years ago as compared to the average age of the family (husband, wife and child) after 3 years?

• A. 3
• B. 10
• C. 17
• D. 7

Answer 1

Answer:

D. 7

The average age of a husband and wife when a child is born to them = (30 × 2) = 60 years The average age of husband and wife 3 years ago = 30 years [Child is not born at that time] The age of family after 3 years(husband, wife and child) = (60 + 3 + 3 + 3) = 69 years average of family(husband, wife and child) after 3 years = (69/3) = 23 years Required difference between their ages = (30 - 23) years = 7 years