A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?

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A's 2 day's work =	❨	1	x 2	❩	=	1	.
		20				10

Work done in 3 days =	❨	1	+	1	❩	=	1	.
		10		10			5

Now,	1	work is done in 3 days.
	5