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      Question

      A, B and C can do a piece of work in 10, 12 and 15

      days,  respectively. In how many days can B do the work, if he is  assisted by A and C together on alternate days?  
      A 5 Correct Answer Incorrect Answer
      B 4 Correct Answer Incorrect Answer
      C 6 Correct Answer Incorrect Answer
      D 3 Correct Answer Incorrect Answer

      Solution

      The correct answer is C

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