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    Question

    The ratio of number of boys to number of girls of a

    class was 2:5. If 4 girls were absent, the ratio becomes 3:7. Find total number of students in the class.
    A 63 Correct Answer Incorrect Answer
    B 84 Correct Answer Incorrect Answer
    C 105 Correct Answer Incorrect Answer
    D 133 Correct Answer Incorrect Answer

    Solution

    Let the number of boys and girls in the class be 2a and 5a respectively.2a/(5a - 4) = 3/714a = 15a - 12a = 12Therefore, total number of students in the class = (2 + 5)*12 = 84

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