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    Question

    If 40% of ‘x’ is 10 less than 60% of ‘y’ and the

    sum of ‘x’ and ‘y’ is 250, then what is the value of ‘x – y’?
    A 18 Correct Answer Incorrect Answer
    B -23 Correct Answer Incorrect Answer
    C 15 Correct Answer Incorrect Answer
    D -20 Correct Answer Incorrect Answer

    Solution

    ATQ,

    0.6y – 0.4x = 10 ………… (1)

    And, x + y = 250 ……………... (2)

    Equation (1) × 2 + Equation (2), we have;

    2y = 270

    Or, y = 135

    So, x = 250 – 135 = 115 [from equation (2)]

    So, x – y = 115 – 135 = –20

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