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    Question

    Class 'A' has 108 students, and the ratio of girls to

    boys is 1:2. If the average number of boys in classes 'A' and 'B' is 144, and the average number of girls in both classes is 72, then what is the total number of students in class 'B'?
    A 324 Correct Answer Incorrect Answer
    B 336 Correct Answer Incorrect Answer
    C 312 Correct Answer Incorrect Answer
    D 318 Correct Answer Incorrect Answer
    E 342 Correct Answer Incorrect Answer

    Solution

    Number of girls in class A = (1/3) × 108 = 36
    Number of boys in class A = (2/3) × 108 = 72
    Number of boys in class B = 144 × 2 - 72 = 288 - 72 = 216
    Number of girls in class B = 72 × 2 - 36 = 144 - 36 = 108
    Total number of students in class B = 216 + 108 = 324

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