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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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