Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 27 Apr 2015, 14:26

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If x not equal to -y, is (x-y)/(x+y) > 1

Author Message
TAGS:
Manager
Joined: 09 Apr 2008
Posts: 53
Followers: 0

Kudos [?]: 5 [1] , given: 4

If x not equal to -y, is (x-y)/(x+y) > 1 [#permalink]  19 Apr 2009, 20:19
1
KUDOS
00:00

Difficulty:

(N/A)

Question Stats:

50% (02:25) correct 50% (01:25) wrong based on 0 sessions
If x not equal to -y, is $$(x-y)/(x+y) > 1$$ ?

1) x>0
2) y<0

The answer explanation uses "number picking" to solve. Is there another way?

Last edited by thinkblue on 19 Apr 2009, 20:35, edited 1 time in total.
Senior Manager
Joined: 01 Mar 2009
Posts: 372
Location: PDX
Followers: 6

Kudos [?]: 70 [0], given: 24

Re: Q128 OG 11th Ed [#permalink]  19 Apr 2009, 20:24
If (x-y)/(x+y) > 1 Then

x-y > x+y
=> 2y>0 or y>0

From B You have y<0 which answers the question. I haven't looked at the answer but is this correct ?

_________________

In the land of the night, the chariot of the sun is drawn by the grateful dead

Manager
Joined: 09 Apr 2008
Posts: 53
Followers: 0

Kudos [?]: 5 [0], given: 4

Re: Q128 OG 11th Ed [#permalink]  19 Apr 2009, 20:37
pbanavara wrote:
If (x-y)/(x+y) > 1 Then

x-y > x+y
=> 2y>0 or y>0

From B You have y<0 which answers the question. I haven't looked at the answer but is this correct ?

Nope that's not it. You have to consider (x+y) could be negative. In which case the inequality changes - not completely sure how.
Even after I did that I didn't get the answer though
Intern
Joined: 13 Apr 2009
Posts: 12
Followers: 0

Kudos [?]: 0 [0], given: 0

Re: Q139 OG 11th Ed [#permalink]  20 Apr 2009, 04:40
so what is the right answer?

I think it is E
Intern
Joined: 18 Feb 2009
Posts: 5
Followers: 1

Kudos [?]: 1 [0], given: 0

Re: Q139 OG 11th Ed [#permalink]  20 Apr 2009, 06:02
even I got E.. but again by number picking.

For S1.. X>0
Case 1: x=4 y=8 Fraction = -1/3 i.e. <1

Case 2: x=4 y=-6 Fraction = -5 <1

Case 3: x=4 y=-2 Fraction = 3 > 1

For S2.. y< 0
Cas2 and Case 3 proves that S2 is not sufficient

Case 1 & Case 2 also proves that S1 and S2 together are also not sufficient.

But will be good to know if this can be done without number picking ... more than individual signs of X and Y, sign of (X+Y) is more vital.

Thanks
Akshay
Manager
Joined: 22 Feb 2009
Posts: 140
Schools: Kellogg (R1 Dinged),Cornell (R2), Emory(Interview Scheduled), IESE (R1 Interviewed), ISB (Interviewed), LBS (R2), Vanderbilt (R3 Interviewed)
Followers: 8

Kudos [?]: 78 [1] , given: 10

Re: Q139 OG 11th Ed [#permalink]  20 Apr 2009, 11:27
1
KUDOS
Is x-y/x+y>1 ?
or we can say is
=> (x-y/x+y)-1>0
=> -2y/x+y >0
=> 2y/x+y<0?

St 1: x>0
Not sufficient to tell whether 2y/x+y < 0

St 2: 2) y<0

Not sufficient to tell whether 2y/x+y < 0

Combining also we cannot say 2y/x+y < 0, therefore E
Intern
Joined: 14 Apr 2009
Posts: 4
Followers: 0

Kudos [?]: 2 [0], given: 0

Re: Q139 OG 11th Ed [#permalink]  21 Apr 2009, 14:24
bandit wrote:
Is x-y/x+y>1 ?
or we can say is
=> (x-y/x+y)-1>0
=> -2y/x+y >0
=> 2y/x+y<0?

St 1: x>0
Not sufficient to tell whether 2y/x+y < 0

St 2: 2) y<0

Not sufficient to tell whether 2y/x+y < 0

Combining also we cannot say 2y/x+y < 0, therefore E

@bandit : Great technique to look at the equation whether it is less than or equal to zero.
But, When we combine then, then we need to use the numbers to confirm that the answer is truly E.
Senior Manager
Joined: 19 Aug 2006
Posts: 250
Followers: 2

Kudos [?]: 7 [0], given: 0

Re: Q139 OG 11th Ed [#permalink]  22 Apr 2009, 20:22
I could not see how to solve it other than by picking numbers.
However, I got E.
Re: Q139 OG 11th Ed   [#permalink] 22 Apr 2009, 20:22
Similar topics Replies Last post
Similar
Topics:
1 If x is not equal to -y, is (x-y)/(x+y) > 1? 12 28 Jul 2011, 03:17
If x is not equal to -y, is (x-y)/(x+y) > 1? 5 03 Apr 2007, 03:16
If x not equal to -y is x-y/x+y > 1? 1. x > 0 2. y 8 14 Jan 2007, 08:47
If x not equal to y , is x-y/x+y > 1 ? 1. x > 0 2. y 9 09 Aug 2006, 12:57
if x is not equal to -y, is (x-y)/(x+y) > 1? 1) x>0 2) 5 18 Dec 2005, 12:46
Display posts from previous: Sort by