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      Question

      A and B can complete a work alone in 20 days and 60 days

      respectively. They began the work together but A left the work after some days and B completed the remaining work in 12 days. After how many days from the beginning A left the work? 
      A 15 days Correct Answer Incorrect Answer
      B 10 days Correct Answer Incorrect Answer
      C 9 days Correct Answer Incorrect Answer
      D 12 days Correct Answer Incorrect Answer

      Solution

      The correct answer is D

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