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    Question

    The marks scored by a boy in three subjects are in the

    ratio 2 : 3 : 4. Boy scored an overall aggregate of 75% in the exam. If the maximum marks in each subject are the same, in how many subjects did boy score more than 70% marks?
    A One Correct Answer Incorrect Answer
    B Three Correct Answer Incorrect Answer
    C none Correct Answer Incorrect Answer
    D Two Correct Answer Incorrect Answer

    Solution

    Let the maximum marks in each subject be 100.
    ∴ Total score = 75% of (100 + 100 + 100) = 75% of (300) = 225
    Also, 75% marks in a subject correspond to 75% of (100) = 75
    Let a boy have scored 2x, 3x and 4x in the three subjects.
    ∴ 2x + 3x + 4x = 225
    ∴ 9x = 225 i.e. x = 25
    Hence, his marks in the three subjects are 50, 75 and 100.
    Hence, he has scored more than 70 in exactly two subject.

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