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    Question

    ‘C’ and ‘D’ can complete a job in 20 days and 25

    days respectively. They completed it together for Rs. 9,000. What will be C’s share?
    A 6000 Correct Answer Incorrect Answer
    B 7000 Correct Answer Incorrect Answer
    C 5000 Correct Answer Incorrect Answer
    D 3600 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the total work be 100 units (LCM of 20 and 25)

    Efficiency of ‘C’ = 100 / 20 = 5 units/day

    Efficiency of ‘D’ = 100 / 25 = 4 units/day

    So, ‘C’ would get = 9000 × (5 / (5+4)) = 9000 × (5/9) = Rs. 5,000

    Alternate solution:

    Ratio of efficiency = 25:20 = 5:4

    C’s share = 9000 × (5/9) = Rs. 5,000

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