A can do a work in 20 days and B in 40 days. If they work

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A can do a work in 20 days and B in 40 days. If they work on it together for 5 days, then the fraction of the work that is left is :

Using basics of Rule 2,
(A + B)’s 5 days’ work

= 5		1	+	1
		20		40

= 5		2 + 1
		40

=	15	=	3
	40		8

∴ Remaining work = 1 -	3	=	5
	8		8