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    Question

    Ratio of number of boys to girls in a school of 840

    students is 5:3. Ratio of number of boys who passed to those who failed in an exam is 11:4 whereas ratio of number of girls who passed to those who failed in the exam is 5:2. Find the number of students who passed in the exam.
    A 482 Correct Answer Incorrect Answer
    B 610 Correct Answer Incorrect Answer
    C 385 Correct Answer Incorrect Answer
    D 875 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Number of boys = (5/8) × 840 = 525

    Number of girls = (3/8) × 840 = 315

    Required number of students = (11/15) × 525 + (5/7) × 315 = 610

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