Multiple choice

5 years ago the average age of a family which includes father, mother and a son was 35 years. 3 years ago the average age of father and mother was 46 years. What is the present age (in years) of the son?

  1. 20

  2. 24

  3. 26

  4. 22
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D Correct answer
Explanation

5 years ago, average age of 3 people was 35, so sum of ages was 105. Present sum of ages = 105 + 15 = 120 (each aged 5 years). 3 years ago, average of father and mother was 46, so sum was 92. Present sum of parents' ages = 92 + 6 = 98. Son's present age = 120 - 98 = 22 years.

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