Question

    Out of 840 students in a college, the proportion of boys

    to girls is 3:4. In the midterm exam, 15% of boys and 10% of girls failed. How many students failed?
    A 240 Correct Answer Incorrect Answer
    B 160 Correct Answer Incorrect Answer
    C 102 Correct Answer Incorrect Answer
    D 285 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Number of boys = (3/7) × 840 = 360

    Number of girls = (4/7) × 840 = 480

    Required number of students = 0.15 × 360 + 0.10 × 480 = 54 + 48 = 102

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