A can do a work in 10 days and B in 20 days. If they together

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A can do a work in 10 days and B in 20 days. If they together work on it for 5 days, then the fraction of the work that is left is

Using basics of Rule 2
Work done by A and B in 1 day

	1	+	1	=	2 + 1	=	3
	10		20		20		20

∴ (A + B)’s 5 days’ work

=	5 × 3	=	3
	20		4

∴ Remaining work

= 1 -	3	=	1
	4		4