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      Question

      Ajay, Bablu and Chirag can complete a certain work in

      21, 28 and 15 days respectively. Ajay and Chirag started the work while Bablu joined them after 5 days and worked with them till the completion of the work. For how many days Bablu worked?
      A 2(6/7) days Correct Answer Incorrect Answer
      B 3(1/2) days Correct Answer Incorrect Answer
      C 4 days Correct Answer Incorrect Answer
      D 2(1/2) days Correct Answer Incorrect Answer

      Solution

      Ajay Bablu  Chirag

      21  28  15

             420           LCM of 21,28,15

      20  15  28

      Ajay And Chirag both working 5 days = (20+28) ×5=240

      Remaining work complete by Ajay Bablu and Chirag =180/63

      =20/7=2(6/7) days

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