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 3 days and worked with them till the completion of the work. For how many days Bablu worked?Solution
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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