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

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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. The number of days B will take to do it alone is

(A + B)’s 1 day’s work =	1
	6

A’s 1 day’s work =	1
	9

∴ B’s 1 day’s work =	1	-	1
	6		9

=	3 - 2	=	1
	18		18

∴ Required time = 18 days