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    Question

    A can finish a piece of work in 10 days and B can finish

    it in 15 days. If both work together, in how many days will the work be completed?
    A 10 days Correct Answer Incorrect Answer
    B 6 days Correct Answer Incorrect Answer
    C 8 days Correct Answer Incorrect Answer
    D 18 days Correct Answer Incorrect Answer

    Solution

    AтАЩs 1-day work = 1/10 BтАЩs 1-day work = 1/15 Combined 1-day work = 1/10 + 1/15 LCM(10, 15) = 30 = 3/30 + 2/30 = 5/30 = 1/6 Time required = 1 ├╖ (1/6) = 6 days Answer: 6 days

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