Multiple choice

Average age of Gupta family is 33.75 years. Mr. Gupta has only two sons (A and B), where A is 25 years younger than his father. Mr. Gupta's wife is 21 years older than her elder son. If A is older than B and average of their ages is 20.5 years, then 3 years hence, what will be the ratio between the ages of B and Mr. Gupta?

  1. 5 : 13

  2. 4 : 9

  3. 3 : 7

  4. 7 : 3

  5. 9 : 17
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A Correct answer
Explanation

Average age of 4 family members = 33.75, so sum = 135. A = F - 25. Wife = ElderSon + 21. Average of A and B = 20.5, so A+B = 41. Solving these equations with the family sum leads to specific ages. 3 years hence, the ratio is calculated.

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