Question
The average age of a husband and a wife was 25 years
when they were married 4 years ago. The average age of the husband, the wife, and their child, who was born during the interval is 20 years now. How old is the child now?Solution
ATQ, Given that, 4yrs. back, the average age of a couple=25yrs. Then, the total==25×2yrs.=50yrs. After 4yrs. the sum will increase by 4×2yrs.=8yrs. Let the child's age=xyrs. Then the toal age of the family=(50+8+x)yrs=(58+x)yrs. Then, by the given condition, = (58+x)/3 =20 =58+x=60 = x = 2yrs
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