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

 It is currently 06 Jul 2015, 04:14

### 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

# Are x and y both positive? 1. 2x-2y = 1 2. x/y >1

Author Message
TAGS:
CEO
Joined: 20 Nov 2005
Posts: 2910
Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
Followers: 19

Kudos [?]: 132 [0], given: 0

Are x and y both positive? 1. 2x-2y = 1 2. x/y >1 [#permalink]  30 Jul 2006, 20:03
00:00

Difficulty:

(N/A)

Question Stats:

100% (00:00) correct 0% (00:00) wrong based on 1 sessions
Are x and y both positive?

1. 2x-2y = 1
2. x/y >1
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

VP
Joined: 29 Dec 2005
Posts: 1348
Followers: 7

Kudos [?]: 37 [0], given: 0

Re: DS: X and Y +ve [#permalink]  30 Jul 2006, 20:13
ps_dahiya wrote:
Are x and y both positive?

1. 2x-2y = 1
2. x/y >1

C.

fromi, x and y can be anything.

from ii x and y both are either +ves or -ves. if they both are +ves, x>y. if they both are -ves, y>x.

from i and ii, x and y both are +ves. they are not -ves. if they are -ves and y>x, 2x-2y cannot be 1. so they both are +ves.

guys, after long time i am back. spare me.
CEO
Joined: 20 Nov 2005
Posts: 2910
Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
Followers: 19

Kudos [?]: 132 [0], given: 0

CHEN wrote:
.
.
.
.
.
.
.
.
.
.
C 100%

More important to others is why?
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

Senior Manager
Joined: 22 May 2006
Posts: 375
Location: Rancho Palos Verdes
Followers: 1

Kudos [?]: 35 [0], given: 0

Re: DS: X and Y +ve [#permalink]  30 Jul 2006, 21:01
Combine S1 and S2.
if y>0
x>y>0
x-y = 1/2 tells that both are positive.

if y<0
x<y<0
x<y=> x-y<0 != 1/2
sufficient.

Thus, C
_________________

The only thing that matters is what you believe.

SVP
Joined: 30 Mar 2006
Posts: 1737
Followers: 1

Kudos [?]: 46 [0], given: 0

C

1) 2x-2y =1
x-y = 1/2

Hence x>y , but y can be -ve. hence not Suff

2) x/y > 1
Hence either x and y both are positive or both are negative. Not suff

Together

Suff.
CEO
Joined: 20 Nov 2005
Posts: 2910
Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
Followers: 19

Kudos [?]: 132 [0], given: 0

Re: DS: X and Y +ve [#permalink]  31 Jul 2006, 06:25
Professor wrote:
ps_dahiya wrote:
Are x and y both positive?

1. 2x-2y = 1
2. x/y >1

C.

fromi, x and y can be anything.

from ii x and y both are either +ves or -ves. if they both are +ves, x>y. if they both are -ves, y>x.

from i and ii, x and y both are +ves. they are not -ves. if they are -ves and y>x, 2x-2y cannot be 1. so they both are +ves.

guys, after long time i am back. spare me.

Thanks.

Where the hell you were hiding???
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

Senior Manager
Joined: 14 Jul 2005
Posts: 402
Followers: 1

Kudos [?]: 12 [0], given: 0

The answer according to me is E

St1 and St2 are satsified if X=1,Y=1/2 i.e. X/Y>1 and X-Y=1/2

But if you choose X=-1/2,Y=-1 you still get X/Y>1 and X-Y=1/2

Am I doing something wrong here ?
VP
Joined: 29 Dec 2005
Posts: 1348
Followers: 7

Kudos [?]: 37 [0], given: 0

Re: DS: X and Y +ve [#permalink]  31 Jul 2006, 17:09
ps_dahiya wrote:
Professor wrote:
ps_dahiya wrote:
Are x and y both positive?

1. 2x-2y = 1
2. x/y >1

C.

fromi, x and y can be anything.

from ii x and y both are either +ves or -ves. if they both are +ves, x>y. if they both are -ves, y>x.

from i and ii, x and y both are +ves. they are not -ves. if they are -ves and y>x, 2x-2y cannot be 1. so they both are +ves.

guys, after long time i am back. spare me.

Thanks.

Where the hell you were hiding???

didn't you see me? i was just behind you!
Senior Manager
Joined: 14 Jul 2005
Posts: 402
Followers: 1

Kudos [?]: 12 [0], given: 0

Oops .. I am wrong... X/Y < 1 for my second scenario... C it is.
Senior Manager
Joined: 22 May 2006
Posts: 375
Location: Rancho Palos Verdes
Followers: 1

Kudos [?]: 35 [0], given: 0

gmatornot wrote:
The answer according to me is E

But if you choose X=-1/2,Y=-1 you still get X/Y>1 and X-Y=1/2
Am I doing something wrong here ?

X=-1/2,Y=-1 X/Y=1/2 < 1...
But S2 says X/Y > 1..
_________________

The only thing that matters is what you believe.

Similar topics Replies Last post
Similar
Topics:
x and y are both positive? (1) 2x-2y = 1 (2) x/y > 1 5 15 Feb 2009, 01:23
1 Are x and y both positive? (1) 2x - 2y = 1 (2) x/y > 1 8 14 May 2008, 16:30
Are x and y both positive? 1) 2x - 2y = 1 2) x/y > 1 OA 3 23 Sep 2007, 09:48
Are x and y both positive? (1) 2x - 2y = 1 (2) x/y > 1 6 22 Aug 2007, 18:30
Are x and y both positive? 1) 2x -2y = 1 2) x/y > 1 I 8 22 Oct 2006, 21:10
Display posts from previous: Sort by