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    Question

    (15 x 15 x 15 + 8 x 8 x 8)/(15 x 15 -15 x 8 + 8 x

    8) = ?
    A 24 Correct Answer Incorrect Answer
    B 25 Correct Answer Incorrect Answer
    C 23 Correct Answer Incorrect Answer
    D 22 Correct Answer Incorrect Answer

    Solution

    Let a = 15, b = 8
    so (15x 15 x 15 + 8 x 8 x 8)/(15 x 15 - 15 x 8 + 8 x 8)
    = (a3 + b3)/(a2 - ab + b2)
    = ((a + b) x (a2 + b2 - ab))/(a2 + b2 - ab)
    = (a+b) = 15+8 = 23.

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