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    Question

    Average of 15 numbers is 78. The average of the first

    seven is 74 and of the last five is 92. The eighth number is 40% of the ninth, and the tenth number is 60% more than the ninth. Find the ninth number.
    A 64 Correct Answer Incorrect Answer
    B 52 Correct Answer Incorrect Answer
    C 24 Correct Answer Incorrect Answer
    D 32 Correct Answer Incorrect Answer

    Solution

    Let ninth number is x Eighth number = 0.40x Tenth number = 1.60x According to question; x + 0.40x + 1.60x = 15 ├Ч 78 тАУ 7 ├Ч 74 тАУ 5 ├Ч 92 = 192 Or, 3x = 192 Or, x = 64

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