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    Question

    In a class, the ratio of number of boys to number of

    girls is 9:4. If 5 boys joined the class and 1 girl left the class, then the ratio becomes 7:3. Find the actual number of girls in the class.
    A 76 Correct Answer Incorrect Answer
    B 80 Correct Answer Incorrect Answer
    C 84 Correct Answer Incorrect Answer
    D 88 Correct Answer Incorrect Answer

    Solution

    Let initially the number of boys and girls be 9x and 4x, respectively.
    (9x + 5) : (4x − 1) = 7 : 3
    Or, 3(9x + 5) = 7(4x − 1)
    Or, 27x + 15 = 28x − 7
    Or, x = 22
    Therefore, number of girls = 4 × 22 = 88

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