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

 It is currently 25 Apr 2015, 19:13

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

QS 30 from Gmat Club test 18

Author Message
Intern
Joined: 16 Apr 2008
Posts: 3
Followers: 0

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

QS 30 from Gmat Club test 18 [#permalink]  14 Nov 2010, 06:20
Is xy > x/y
1) 0<y<1
2) xy >1

Statement (1) ALONE is sufficient, but Statement (2) ALONE is not

sufficient
Statement (2) ALONE is sufficient, but Statement (1) ALONE is not

sufficient
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is

sufficient
EACH statement ALONE is sufficient
Statements (1) and (2) TOGETHER are NOT sufficient

Shouldn't the answer be B and not C ?

If xy> 1 ; then either x or y can't be 0, x or y can't be -ve. x & y can only be both negative or both are positive then xy > x/y. So B shpuld be sufficient
Manager
Joined: 09 Jun 2010
Posts: 116
Followers: 2

Kudos [?]: 64 [1] , given: 1

Re: QS 30 from Gmat Club test 18 [#permalink]  14 Nov 2010, 07:12
1
KUDOS
consider :
$$X=4$$ & $$Y=$$ $$1/2$$
$$xy = 2$$ & $$x/y$$$$= 8$$

$$x= 4$$ & $$y=2$$

$$xy = 8$$ & $$x/y$$$$=2$$

B is not sufficient.
Considering both statements together we get $$xy<x/y$$

Correct option C
Intern
Joined: 01 Dec 2011
Posts: 13
Followers: 0

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

Re: QS 30 from Gmat Club test 18 [#permalink]  13 Dec 2011, 05:54

(1) 0<y<1 ---> xy > x/y if x=4 and y=0.5 xy= 2 and x/y= 4/ 5/10 = (4*10)/5 = 8 --> xy < x/y
if x=0.5 and y=0.2 xy=0.1 and x/y= 0.5/0.2 = 2.5 --> xy < x/y

So statement 1 ALONE is sufficient to answer the question.

(2) xy>1 ---> xy > x/y if x=1 and y=2 xy= 2 and x/y=1/2 ---> xy > x/y
if x=3 and y=0.5 xy= 1.5 and x/y=6 ----> xy < x/y

So statement 2 ALONE is NOT sufficient to answer the question.

Answer A is the right solution I think.
Manager
Joined: 17 Oct 2011
Posts: 241
Location: United States
Concentration: Strategy, Marketing
GMAT 1: 720 Q51 V36
Followers: 4

Kudos [?]: 77 [0], given: 36

Re: QS 30 from Gmat Club test 18 [#permalink]  13 Dec 2011, 09:09
andyhere4u wrote:
Is xy > x/y
1) 0<y<1
2) xy >1

Statement (1) ALONE is sufficient, but Statement (2) ALONE is not

sufficient
Statement (2) ALONE is sufficient, but Statement (1) ALONE is not

sufficient
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is

sufficient
EACH statement ALONE is sufficient
Statements (1) and (2) TOGETHER are NOT sufficient

Shouldn't the answer be B and not C ?

If xy> 1 ; then either x or y can't be 0, x or y can't be -ve. x & y can only be both negative or both are positive then xy > x/y. So B shpuld be sufficient

A alone is not sufficient as we don't know whether x is 0 or not.
B alone is not sufficient as we don't know if x>1 and 0<y<1 or x and y > 1
say x=4, y=0.5, xy=2>1, but x/y=8 xy<x/y
if x=4 and y=2, then xy=8, x/y=2 xy>x/y

A and B together, we know that x is not 0 and 0<y<1, is xy>x/y can definitely be answered.

hope this helps
Intern
Joined: 01 Dec 2011
Posts: 13
Followers: 0

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

Re: QS 30 from Gmat Club test 18 [#permalink]  13 Dec 2011, 12:55
sanjuro9 wrote:
andyhere4u wrote:
Is xy > x/y
1) 0<y<1
2) xy >1

Statement (1) ALONE is sufficient, but Statement (2) ALONE is not

sufficient
Statement (2) ALONE is sufficient, but Statement (1) ALONE is not

sufficient
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is

sufficient
EACH statement ALONE is sufficient
Statements (1) and (2) TOGETHER are NOT sufficient

Shouldn't the answer be B and not C ?

If xy> 1 ; then either x or y can't be 0, x or y can't be -ve. x & y can only be both negative or both are positive then xy > x/y. So B shpuld be sufficient

A alone is not sufficient as we don't know whether x is 0 or not.
B alone is not sufficient as we don't know if x>1 and 0<y<1 or x and y > 1
say x=4, y=0.5, xy=2>1, but x/y=8 xy<x/y
if x=4 and y=2, then xy=8, x/y=2 xy>x/y

A and B together, we know that x is not 0 and 0<y<1, is xy>x/y can definitely be answered.

hope this helps

I completely forgot the 0...

Thank you !
Re: QS 30 from Gmat Club test 18   [#permalink] 13 Dec 2011, 12:55
Similar topics Replies Last post
Similar
Topics:
1 Gmat club test Quant 07 , Q18 12 11 Apr 2011, 17:27
1 GMAT CLUB TEST m18 - question 15 5 22 Jul 2010, 15:14
Question from Gmat club test 1 08 Jul 2010, 03:57
Contents of the GMAT Club test m18-m24 2 29 Jun 2010, 11:41
32 GMAT Tests from GMAT Club 32 17 May 2010, 07:59
Display posts from previous: Sort by

QS 30 from Gmat Club test 18

Moderators: Bunuel, WoundedTiger

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.