Exams › IBPS PO › Quantitative Aptitude
The average age of a family of 9 members is 20 years. If the age of the youngest son is 8 years, then the average age of the members of the family just before the birth of the youngest son was.
- 15 years
- 11.5 years
- 12 years
- 13.5 years
Correct answer: 13.5 years
Solution
Current total = 9 × 20 = 180. Youngest son's age = 8. Total age of remaining 8 members now = 172. Eight years ago (just before youngest's birth), each of the 8 members was 8 years younger → their total = 172 - 64 = 108. Average = 108/8 = 13.5 years.
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