1.

A does 4/5th of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?

Answer»

37 ½ days



A can FINISH the whole work in 20 × 5/4 days = 25 days 
A and B together finish the whole work in 5 × 3 days = 15 days 
Therefore, B can finish the whole work in25 B/ 25 + B = 15 



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