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    Question

    The average age of a husband and his wife was 23 years

    when they were married 5 years ago. The average age of the husband, the wife and their child is 20 years now. How old is the child now?
    A 9 months Correct Answer Incorrect Answer
    B 1 year Correct Answer Incorrect Answer
    C 3 years Correct Answer Incorrect Answer
    D 4 years Correct Answer Incorrect Answer

    Solution

    Let present ages of husband, wife and child be x, y and z years respectively. Given, ⇒ [(x – 5) + (y – 5)]/ 2 = 23 ⇒ x + y = 46 + 10 = 56 Given, ⇒ (x + y + z)/3 = 20 ⇒ x + y + z = 60 ⇒ 56 + z = 60 ⇒ z = 4 ∴ Child is 4 years old now.

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