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 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

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