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    Question

    The average age of a class of 23 girls is 15 years. If 2

    new girls having average age of 10 years join the class, then the average age of the class becomes:
    A 17.5 years Correct Answer Incorrect Answer
    B 13.6 years Correct Answer Incorrect Answer
    C 15.2 years Correct Answer Incorrect Answer
    D 14.6 years Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Total age of 23 girls = 23 Ă— 15 = 345 years Total age of 25 girls = 345 + (2 Ă— 10) = 365 years Therefore new average age = 365/25 = 14.6 years

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