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?Solution
Ajay Bablu Chirag
21Â 28Â 15
      420      LCM of 21,28,15
20Â 15Â 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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