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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

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At the time of marriage of a son the average of age of mother, father and son is 42 yrs. After one year of marriage a baby is born when the baby turns 5 years old then the average age of whole family is 36 years. Find the age of their daughter-in-law at the time of her marriage.

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