A can finish a work in 18 days and B can do the same work

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A can finish a work in 18 days and B can do the same work in half the time taken by A. Then working together what part of the same work they can finish in a day ?

Using basics of Rule 2,

A’s 1 day’s work =	1
	18

B’s 1 day’s work =	1
	9

∴ (A + B)’s 1 day’s work

=	1	+	1	=	1 + 3	=	1
	18		9		18		6