A and B can do a job together in 7 days. A is 1 3/4 times as efficient as B. The same job can be done by A alone in :

1.

A and B can do a job together in 7 days. A is 1 1-div-3by4 times as efficient as B. The same job can be done by A alone in :

[A].	9 1/3 days
[B].	11 days
[C].	12 1/4 days
[D].	16 1/3 days

Answer: Option B

Explanation:

(A's 1 day's work) : (B's 1 day's work) =	7	: 1 = 7 : 4.
	4

Let A's and B's 1 day's work be 7x and 4x respectively.

Then, 7x + 4x =	1	11x =	1	x =	1	.
	7		7		77

A's 1 day's work =		1	x 7		=	1	.
		77				11

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