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    Question

    A and B together can do a piece of work in 6 days and A

    alone can do the same piece of work in 15 days. If both start working together and B works only half a day daily, then find the number of days A and B together can do the piece of work?
    A 5*1/7 days Correct Answer Incorrect Answer
    B 9*5/7 days Correct Answer Incorrect Answer
    C 7*2/7 days Correct Answer Incorrect Answer
    D 8*4/7 days Correct Answer Incorrect Answer

    Solution

    A’s one day work = 1/15 part B’s one day work = 1/6 - 1/15 = (5-2)/30 = 1/10 part A’s one day work + B’s half day work = 1/15 + 1/20 = (4+3)/60 = 7/60 part Hence, A and B can together can do the work in = 60/7 = 8*4/7 days.

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