A and B together can do a piece of work in 9 days. If A

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A and B together can do a piece of work in 9 days. If A does thrice the work of B in a given time, the time A alone will take to finish the work is

Let time taken by A be x days.
∴ Time taken by B = 3x days
According to the question,

⇒	1	+	1	=	1
	x		3x		9

⇒	3 + 1	=	1
	3x		9

⇒ 3x = 4 × 9

⇒ x =	4 × 9	= 12 days
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