A and B can together complete a piece of work in 4 days . If A alone can complete the same work in 12 days, in how many days can B alone complete that work?

A and B can together complete a piece of work in 4 days . If A alone can complete the same work in 12 days, in how many days can B alone complete that work? Correct Answer 6 days

1A + 1B = 14⇒112 + 1B = 14⇒1B = 14 - 112⇒1B = 3 - 112⇒1B = 212⇒1B = 16.'.B = 6 So, B taken 6 days to finish the work alone.
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