A and B can do a job together in 7 days. A is 1¾ times as efficient as B. The same job can be done by A alone in :

9 1 days 3
11 days
12 1 days 4
16 1 days 3

Correct Answer: 11 days

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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