A can do a piece of work in 20 days which B can do in 12

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A can do a piece of work in 20 days which B can do in 12 days. B worked at it for 9 days. A can finish the remaining work in

Work done by B in 9 days

=	9	=	3	part
	12		4

Remaining work

= 1 -	3	=	1
	4		4

which is done by A

∴ Time taken by A =	1	× 20 = 5 days.
	4