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    Question

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

    ratio 3 : 5 : 6. Boy scored an overall aggregate of 70% in the exam. If the maximum marks in each subject are the same, in how many subjects did boy score more than 75% 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
    E Cannot be determined Correct Answer Incorrect Answer

    Solution

    Let the maximum marks in each subject be 100.
    ∴ Total score = 70% of (100 + 100 + 100) = 70% of (300) = 210
    Also, 75% marks in a subject correspond to 75% of (100) = 75
    Let a boy have scored 4x, 5x and 6x in the three subjects.
    ∴ 3x + 5x + 6x = 210
    ∴ 14x = 210 i.e. x = 15
    Hence, his marks in the three subjects are 45, 75 and 90.
    Hence, he has scored more than 75 in exactly one subject.

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