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    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?
    A 1 year Correct Answer Incorrect Answer
    B 2.5 years Correct Answer Incorrect Answer
    C 3 years Correct Answer Incorrect Answer
    D 2 years Correct Answer Incorrect Answer

    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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