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    Question

    Jason alone can complete a piece of work in 20 days. In

    how many days can Jamal alone do the same work, if both of them together can do the same work in 9 days? 
    A 11(4/11) Days Correct Answer Incorrect Answer
    B 16(4/11) Days Correct Answer Incorrect Answer
    C 16(16/11) Days Correct Answer Incorrect Answer
    D 6(4/11) Days Correct Answer Incorrect Answer

    Solution

    Let’s assume the total work = 1 unit (or 1 whole work).

    So, Jason’s 1 day work =  1/20

    Jason + Jamal’s 1 day work together = 1/9

    Jamal’s 1 day work = (Jason + Jamal)'s 1 day work − Jason’s 1 day work = 1/9 - 1/20 = 11/180

    Jamal alone can complete the work in  180/ 11 days, or approximately 16.36 days

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