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    Question

    ‘X’, ‘Y’ and ‘Z’ jointly hired a machine to do

    a task. If they used it for 6, 9, and 5 hours respectively, and the total cost came to Rs. 1000, how much was Z’s contribution?
    A Rs.157 Correct Answer Incorrect Answer
    B Rs.126 Correct Answer Incorrect Answer
    C Rs.250 Correct Answer Incorrect Answer
    D Rs.105 Correct Answer Incorrect Answer

    Solution

    ATQ,
    Assume cost per hour is Rs. ‘x’.

    Then ‘X’, ‘Y’ and ‘Z’ paid Rs. 6x, Rs. 9x, and Rs. 5x respectively.

    So, 6x + 9x + 5x = 1000

    ⇒ 20x = 1000

    ⇒ x = 50

    Z’s share = 5x = 5 × 50 = Rs. 250

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