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      Question

      A alone can complete a work in 18 days and B alone can

      complete it in 27 days. They work together for 6 days and then B leaves. In how many more days will A finish the remaining work?
      A 2 days Correct Answer Incorrect Answer
      B 8 days Correct Answer Incorrect Answer
      C 5 days Correct Answer Incorrect Answer
      D 7 days Correct Answer Incorrect Answer

      Solution

      A’s 1-day work = 1/18 B’s 1-day work = 1/27 (A + B)’s 1-day work = 1/18 + 1/27 = (3 + 2)/54 = 5/54 Work done in 6 days = 6 × 5/54 = 30/54 = 5/9 Remaining work = 1 − 5/9 = 4/9 Time taken by A to do 4/9 work = (4/9) ÷ (1/18) = (4/9) × 18 = 8 days

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