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    Question

    Determine the number of GirlsĀ  in a school of 60

    StudentĀ  when you know that the average weight of all StudentĀ  is 50 kgs, the average weight of boys is 65 kgs, and the average weight of GirlsĀ  is 45 kgs.
    A 28 Correct Answer Incorrect Answer
    B 25 Correct Answer Incorrect Answer
    C 45 Correct Answer Incorrect Answer
    D 16 Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    ATQ, Desired ratio =Ā  3:1 Ratio of number of boys AndĀ  girls = 1:3 Number of girls in the school isĀ  = (3/4) Ɨ 60 = 45

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