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    Question

    What is the value of ‘x’ if x% of 720 added to {2160

    ÷ x of 20} × 2 gives 180?
    A 25 Correct Answer Incorrect Answer
    B 12 Correct Answer Incorrect Answer
    C 10 Correct Answer Incorrect Answer
    D 5 Correct Answer Incorrect Answer

    Solution

    ATQ,

    x% of 720 + {2160 ÷ x of 20} × 2 = 180

    Or, 7.2x + 432/x = 180

    Or, Multiply both sides by 10:

    72x + 4320/x = 1800

    Or, x² – 25x + 60 = 0

    Or, x² – 20x – 5x + 100 = 0

    Or, x(x – 20) – 5(x – 20) = 0

    Or, (x – 5)(x – 20) = 0

    Or, x = 5 or x = 20

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