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If x, y, and k are positive numbers such that 35x/(x-y) [#permalink]
 30 Oct 2012, 12:46
Question Stats:
16% (06:24) correct
83% (01:01) wrong based on 1 sessions
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
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Re: If x, y, and k are positive numbers such that 35x/(x-y) [#permalink]
30 Oct 2012, 19:59
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 Is the OA correct for this? The ans should be E.
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Re: If x, y, and k are positive numbers such that 35x/(x-y) [#permalink]
30 Oct 2012, 21:42
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.
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Re: If x, y, and k are positive numbers such that 35x/(x-y) [#permalink]
30 Oct 2012, 21:47
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 
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Re: If x, y, and k are positive numbers such that 35x/(x-y) [#permalink]
31 Oct 2012, 12:40
MacFauz wrote: If x, y and k are all +ve numbers, how could k be any of the answer choices??.
Kudos Please... If my post helped. Great notation, I havn't noticed it initially ))
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Re: If x, y, and k are positive numbers such that 35x/(x-y) [#permalink]
02 Nov 2012, 12:50
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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Re: If x, y, and k are positive numbers such that 35x/(x-y) [#permalink]
03 Dec 2012, 11:53
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.
GoGMAT Team
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Re: If x, y, and k are positive numbers such that 35x/(x-y)
[#permalink]
03 Dec 2012, 11:53
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