A and B can together finish a work 30 days. They worked together for 20 days and then B left. After another 20 days, A finished the remaining work. In how many days A alone can finish the work?

1.

A and B can together finish a work 30 days. They worked together for 20 days and then B left. After another 20 days, A finished the remaining work. In how many days A alone can finish the work?

[A].	40
[B].	50
[C].	54
[D].	60

Answer: Option D

Explanation:

(A + B)'s 20 day's work =		1	x 20		=	2	.
		30				3

Remaining work =		1 -	2		=	1	.
			3			3

Now,	1	work is done by A in 20 days.
	3

Therefore, the whole work will be done by A in (20 x 3) = 60 days.

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