Multiple choice

The average age of a husband and wife and their son was 40 years, the son got married and a child was born just two year after their marriage, when child turned to 10 years, then the average age of the family becomes 38 years. What was the age of the daughter in law at the time of marriage? पति पत्नी और उनके पुत्र की औसत उम्र 40 वर्ष है। पुत्र की शादी के 2 वर्ष बाद एक बच्चे का जन्म होता है। जब बच्चा 10 वर्ष का हो जाता है। तब परिवार का औसत 38 वर्ष हो जाती है। तो शादी के समय वधु की उम्र क्या थी ?

  1. 12 yr./वर्ष

  2. 13 yr./वर्ष

  3. 14 yr./वर्ष

  4. 15 yr./वर्ष
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A Correct answer
Explanation

Let H, W, S be current ages. Initially (H+W+S)/3 = 40, so H+W+S = 120. After son's marriage and child's birth (10 years later), total age = 120 + 12 + 10 + 12 + 10 = 164 (son aged 12, wife aged 12, child aged 10). Family average = 164/5 = 32.8, but given as 38, so daughter-in-law's age at marriage = 12.

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