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 3 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 3 days = (20+28) ×3=144 Remaining work=420-144=276 Remaining work complete by Ajay Bablu and Chirag =276/63 =92/21=4(8/21) days
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