Question

    4 years ago, the average age of a family of six persons

    was 30 years. In between these 4 years the family adopted a girl. Now at present the average age of the family is same as it was 4 years ago. Find the present age of the girl.
    A 5 years Correct Answer Incorrect Answer
    B 6 years Correct Answer Incorrect Answer
    C 2 years Correct Answer Incorrect Answer
    D 8 years Correct Answer Incorrect Answer

    Solution

    Sum of the present age of the family excluding girl = 6 x (30 + 4) = 204 years Sum of the present age of the family including girl = 7 x 30 = 210 years Present age of the girl = 210 – 204 = 6 years

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