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    Question

    The number of students in class 'A' is 104, and the ratio

    of girls to boys is 4:9. If the average number of boys in classes 'A' and 'B' is 124, and the average number of girls is 96, find the total number of students in class 'B'.
    A 336 Correct Answer Incorrect Answer
    B 348 Correct Answer Incorrect Answer
    C 328 Correct Answer Incorrect Answer
    D 352 Correct Answer Incorrect Answer
    E 344 Correct Answer Incorrect Answer

    Solution

    Number of girls in class A = (4/13) × 104 = 32
    Number of boys in class A = (9/13) × 104 = 72
    Number of boys in class B = 124 × 2 - 72 = 248 - 72 = 176
    Number of girls in class B = 96 × 2 - 32 = 192 - 32 = 160
    Total number of students in class B = 176 + 160 = 336

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