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?
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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