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    Question

    P can complete a job in 30 days. Q alone can complete

    the same job in 20 days. P works for 18 days and then the remaining job is completed by Q. How many days will it take for Q to complete the remaining job alone?
    A 5 days Correct Answer Incorrect Answer
    B 4 days Correct Answer Incorrect Answer
    C 6 days Correct Answer Incorrect Answer
    D 8 days Correct Answer Incorrect Answer
    E 12 days Correct Answer Incorrect Answer

    Solution

    P’s 1 day work = 1/30 P’s 18 day work = 18/30 = 3/5 days,Remaininng work = 1 - 3/5 = 2/5 Q’s 1 day work = 1/20 days, Q’s 2/5 day work = 1/20 × 5/2 = 1/8 Q will complete the remaining job alone in 8 days.

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