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Re: If x, y, and k are positive numbers such that 35x/(x-y) [#permalink]
03 Dec 2012, 10:53

1

This post received KUDOS

If number k such that k=35x/(x-y)+(70y-70x)/(x-y) for some positive numbers x and y, and if x>y, which of the following could be a value for k? -85 -75 -65 -35 -20 Explanation: First of all simplify expression for k: k=35x/(x-y)+(70y-70x)/(x-y)=(35x+70y-70x)/(x-y)=(70y-35x)/(x-y)=(35y+35y-35x)/(x-y)=35y/(x-y)-35 Since y>0 and x>y, 35y/(x-y)>0 or 35y/(x-y)-35>0-35 or k>-35. The answer is E.

Re: If x, y, and k are positive numbers such that 35x/(x-y) [#permalink]
20 Sep 2013, 17:27

1

This post received KUDOS

actleader wrote:

Hi! Could you help with the following... what is the best strategy? Thanx

If x, y, and k are positive numbers such that [35x][/(x-y)] +[(70y-70x)][/(x-y)]=k , and if x>y , which of the following could be a value for k?

(A) −85 (B) −70 (C) −65 (D) −35 (E) −20

The easiest way I found is K = 35/[1-Y/X] - 70 35/[1-Y/X] is always >35 [as the denominator is always between 0 and 1] therefore K>-35, hence K can only be -20

Re: If x, y, and k are positive numbers such that 35x/(x-y) [#permalink]
30 Oct 2012, 20:42

If x, y and k are all +ve numbers, how could k be any of the answer choices??. I can only get k>-35 and so only E satisfies the requirement. But even then, the requirement that k is a postive number is not satisfied.

Kudos Please... If my post helped. _________________

Did you find this post helpful?... Please let me know through the Kudos button.

Re: If x, y, and k are positive numbers such that 35x/(x-y) [#permalink]
30 Oct 2012, 20:47

MacFauz wrote:

If x, y and k are all +ve numbers, how could k be any of the answer choices??. I can only get k>-35 and so only E satisfies the requirement. But even then, the requirement that k is a postive number is not satisfied.

Kudos Please... If my post helped.

Yup, this question is posted second time on forum... and again its incorrect _________________

Re: If x, y, and k are positive numbers such that 35x/(x-y) [#permalink]
02 Nov 2012, 11:50

Vips0000 wrote:

MacFauz wrote:

If x, y and k are all +ve numbers, how could k be any of the answer choices??. I can only get k>-35 and so only E satisfies the requirement. But even then, the requirement that k is a postive number is not satisfied.

Kudos Please... If my post helped.

Yup, this question is posted second time on forum... and again its incorrect

I've brang the question up. Waiting for the GoGMAT answer.

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