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    Question

    In an examination the average marks of Rohit is 60. If

    he got 15 more marks in science and 21 more marks in maths then his average would have been 66. Find the total number of subjects he studied?
    A 6 Correct Answer Incorrect Answer
    B 7 Correct Answer Incorrect Answer
    C 8 Correct Answer Incorrect Answer
    D 9 Correct Answer Incorrect Answer
    E 10 Correct Answer Incorrect Answer

    Solution

    Let total number of subjects be x. Then,  => (60x + 21 + 15)/x = 66 => 60x + 21 + 15 = 66x => 6x = 36 => x = 6

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