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      Question

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

      complete the same work in 18 days. In how many days can they together complete 5/6 of the work?
      A 12 days Correct Answer Incorrect Answer
      B 10 days Correct Answer Incorrect Answer
      C 18 days Correct Answer Incorrect Answer
      D 20 days Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      A's 1-day work = 1/12 B's 1-day work = 1/18 Together 1-day work = 1/12 + 1/18 = 3/36 + 2/36 = 5/36 Time to complete 5/6 of work: = (5/6) / (5/36) = (5/6) x (36/5) = 6 days Hence, the correct answer is 6 days.

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