Multiple choice

\text{Average age of 5 boys is 16 years, of which that of 4 boys is 16 years 3 months. The age of the 5th boy is}

  1. 15 years

  2. 15 years 6 month

  3. 15 years 4 month

  4. 15 years 2 months
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Average age of 5 boys = 16 years, so total age = 5 × 16 = 80 years. Average age of 4 boys = 16 years 3 months = 16.25 years, so their total = 4 × 16.25 = 65 years. Age of 5th boy = 80 - 65 = 15 years. This matches Option A exactly. Option B (15 years 6 months) and C (15 years 4 months) are close but incorrect.

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