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    Question

    A school has 720 students. The ratio of boys to girls is

    4:2. Among the boys, the passed to failed ratio is 9:3. Among the girls, the passed to failed ratio is 6:2. Find how many students passed the exam.
    A 760 Correct Answer Incorrect Answer
    B 615 Correct Answer Incorrect Answer
    C 540 Correct Answer Incorrect Answer
    D 375 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Number of boys = (4/6) × 720 = 480

    Number of girls = (2/6) × 720 = 240

    Required number of students = (9/12) × 480 + (6/8) × 240 = 360 + 180 = 540

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