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    Question

    Calculate the value of x if x% of 400 plus {800 ÷ x of 8}

    × 4 is equal to 88
    A 25 Correct Answer Incorrect Answer
    B 19 Correct Answer Incorrect Answer
    C 10 Correct Answer Incorrect Answer
    D 5 Correct Answer Incorrect Answer

    Solution

    ATQ,

    x% of 400 + {800 ÷ x of 8} × 4 = 88

    Or, 4x + 320/x = 88

    Or, x² – 22x + 80 = 0

    Or, x² – 10x – 12x + 80 = 0

    Or, x(x – 10) – 12(x – 10) = 0

    Or, (x – 12)(x – 10) = 0

    Or, x = 10 or x = 12

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