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    Question

    A and B together can complete a work in 12 days. B alone

    can complete the same work in 30 days. In how many days will A alone complete the work?
    A 15 days Correct Answer Incorrect Answer
    B 16 days Correct Answer Incorrect Answer
    C 18 days Correct Answer Incorrect Answer
    D 20 days Correct Answer Incorrect Answer

    Solution

    Let the total work be 1 unit. A + BтАЩs 1-day work = 1/12, and BтАЩs 1-day work = 1/30. AтАЩs 1-day work = 1/12 - 1/30 = 3/60 = 1/20. So, A alone will complete the work in 20 days. Answer: d) 20 days.

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