The average age of mother, father and son was 42 years, at the time of the marriage of the son. After one year an infant was born in the family and after 6 years of marriage the average age of the family became 36 years. What was the age of the bride at the time of marriage?

The average age of mother, father and son was 42 years, at the time of the marriage of the son. After one year an infant was born in the family and after 6 years of marriage the average age of the family became 36 years. What was the age of the bride at the time of marriage? Correct Answer 25 years

Total age of Mother + Father + Son = 42 × 3 = 126 years

After 6 years total age of M + F + S + Daughter-in-law + baby = 36 × 5 = 180 years.

After 6 years

 Age of Mother = M + 6

Age of Father = F + 6

Age of Son = S + 6

Total age of Mother, Father and Son = 126 + 18 = 144 years.

144 + Daughter in law + 5 = 180 (where the baby is of 5 years as he is born after one year of marriage)

Daughter in law = 180 - 149 = 31 years.

∴ The age of the daughter in law at the time of the marriage = 31 - 6 = 25 years

∴ 25 years is the age of the bride at the time of the marriage.

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