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    Question

    A can finish a piece of work in 12 days and B can finish

    it in 20 days. If they work together, in how many days will they finish the work?
    A 18 days Correct Answer Incorrect Answer
    B 12 days Correct Answer Incorrect Answer
    C 7.5 days Correct Answer Incorrect Answer
    D 2.5 days Correct Answer Incorrect Answer

    Solution

    A’s 1-day work = 1/12 B’s 1-day work = 1/20 (A + B)’s 1-day work = 1/12 + 1/20 = (5 + 3) / 60 = 8/60 = 2/15 Time taken together = 1 ÷ (2/15) = 15/2 = 7.5 days Answer: 7.5 days

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