Multiple choice

4 years ago the average age of a family which includes father, mother and a son was 24 years. 3 years hence the average age of father and mother age will be 40 years. What is the present age (in years) of the son?

  1. 12

  2. 8

  3. 10

  4. 11
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

4 years ago, family total = 24 × 3 = 72. Present total = 72 + 12 = 84. In 3 years, parents' average = 40, so parents' sum then = 80. Parents' present sum = 80 - 6 = 74. Son's present age = 84 - 74 = 10 years. Option C is correct.

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