A can do a piece of work in 25 days and B can do the same

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A can do a piece of work in 25 days and B can do the same work in 30 days. They work together for 5 days, how much of work is left ?

(A + B)’s 1 day’s work

=	1	+	1	=	6 + 5	=	11
	25		30		150		150

∴ (A + B)’s 5 days’ work

=	5 × 11	=	11
	150		30

∴ Remaining work

= 1 –	11	=	30 - 11	=	19
	30		30		30