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      Question

      A and B individually can complete the work in 20 days

      and 30 days respectively. If the time taken by C alone to complete the work is 1.25 times the time taken by A and B together to complete the work, find the time taken by C to complete the work while working alone.
      A 21 days Correct Answer Incorrect Answer
      B 27 days Correct Answer Incorrect Answer
      C 15 days Correct Answer Incorrect Answer
      D 24 days Correct Answer Incorrect Answer
      E 12 days Correct Answer Incorrect Answer

      Solution

      Time taken by A and B together to complete the work = (20 × 30)/ (20 + 30) = 12 days Time taken by C alone to complete the work = 1.25 × 12 = 15 days

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