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    Question

    The average age of a class of 20 girls is 14 years. If 5

    new girls having average age of 9 years join the class, then the average age of the class becomes:
    A 9.5 years Correct Answer Incorrect Answer
    B 11.4 years Correct Answer Incorrect Answer
    C 17 years Correct Answer Incorrect Answer
    D 13 years Correct Answer Incorrect Answer
    E 22.5 years Correct Answer Incorrect Answer

    Solution

    Total age of 20 girls = 20×14 = 280 years Total age of 25 girls = 280 + (5×9) = 325 years Therefore new average age = 325/25 = 13 years

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