A completes a task in 25 days. B will do the same thing in 30 days. A and B started doing that work together. 4 days later, 'A' quit that job and 'B' finished the rest. How many days does it take for B to complete the rest of the work?
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In 1 day A works 1/25 part
In 1 day B works 1/30 part
so,A and B together in 1 day
(1/25+1/30)part=11/150part
In 4 days A and B together works 4×11/150part
=44/150part
remaining work=(1-44/150)part=106/150 part
B,1/30 part works in 1 day
106/150 part works in30×106/150 days
=106/5days
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