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When the average age of a couple and their son was 42 years, the son married and got a child after one year. When the child was 5 years old, the average age of the family became 36 years. What was the age of daughter-in- law at the time of their marriage ?

A. 23 years B. 24 years C. 25 years D. 26 years Answer: Option C
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Solution(By Apex Team)

Sum of the ages of father, mother and son at the time of son’s marriage = (42 × 3) years = 126 years Sum of the present ages of father, mother and son = (126 + 3 × 6)years = 144 years Sum of the present ages of father, mother, son and grandson = (144 + 5) years = 149 years Sum of the present ages of father, mother, son, daughter-in-law and grandson = (36 × 5) years = 180 years Daughter-in-law’s present age = (180 – 149) years = 31 years ∴ Age of daughter-in-law at the time of marriage = (31 – 6) years = 25 years

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