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?

A 92/21
B 37/29
C 24/23
D 63/29
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