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    Question

    7 years ago, the average age of a family of four persons

    was 30 years. In between these 7 years the family adopted a girl. Now at present the average age of the family is same as it was 7 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 = 4 × (30 + 7) = 148 years Sum of the present age of the family including girl = 5 × 30 = 150 years Present age of the girl = 150 – 148 = 2 years

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