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    Question

    The average age of a class of 21 girls is 16 years. If 4

    new girls having average age of 11 years join the class, then the average age of the class becomes:
    A 12.5 years Correct Answer Incorrect Answer
    B 16 years Correct Answer Incorrect Answer
    C 15.2 years Correct Answer Incorrect Answer
    D 14 years Correct Answer Incorrect Answer

    Solution

    Total age of 21 girls = 21 × 16 = 336 years Total age of 25 girls = 336 + (4 × 11) = 380 years Therefore new average age = 380/25 = 15.2 years

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