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    Question

    The number of students in class 'A' is 128, and the

    ratio of the number of girls to boys is 5:11. If the average number of boys in classes A and B is 148, and the average number of girls is 102, find the total number of students in class B.
    A 372 Correct Answer Incorrect Answer
    B 384 Correct Answer Incorrect Answer
    C 360 Correct Answer Incorrect Answer
    D 376 Correct Answer Incorrect Answer

    Solution

    Number of girls in class A = (5/16) ├Ч 128 = 40
    Number of boys in class A = (11/16) ├Ч 128 = 88
    Number of boys in class B = 148 ├Ч 2 - 88 = 296 - 88 = 208
    Number of girls in class B = 102 ├Ч 2 - 40 = 204 - 40 = 164
    Total number of students in class B = 208 + 164 = 372

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