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    Question

    5 years ago, the average age of a family of five persons

    was 30 years. In between these 5 years the family adopted a girl. Now at present the average age of the family is same as it was 5 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
    E None of these Correct Answer Incorrect Answer

    Solution

    Sum of the present age of the family excluding girl = 5 x (30 + 5) = 175 years Sum of the present age of the family including girl = 6 x 30 = 180 years Present age of the girl = 180 – 175 = 5 years

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