A and B together can do a piece of work in 6 days and A alone can do it in 9 days. In how many days can B alone can do it?

A and B together can do a piece of work in 6 days and A alone can d

1.	A and B together can do a piece of work in 6 days and A alone can do it in 9 days. In how many days can B alone can do it?
A.	12 days
B.	15 days
C.	18 days
D.	21 days
Answer» D. 21 days

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A and B together can do a piece of work in 6 days and A alone can do it in 9 days. In how many days can B alone can do it?

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