afiggy1 wrote:

Please help if you can!

Are x and y both positive?

(1) 2x - 2y = 1

(2) (x/y) > 1

Naturally, I can eliminate both on their own, but testing to see if both or neither are sufficient is time consuming. Does anyone have any tips to get through this question quickly? I got it right after about 3 mins of work

From 1-> x=(2y+1)/2 . form this statement we cannot say that x and y are both positive.

From 2 -> (x/y)>1. So the value of x is y+something. But still its insufficient.

From both the statements combine we have x=(2y+1)/2 and (x/y)>1.

Now x/y = [(2y+1)/2]/y = (2y+1)/2y = 1+1/2y.

This expression shows that when y is +ve then and only then is the value of x/y >1. So answere is C.

Javed.

Cheers!