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

It is currently 03 Aug 2015, 06:01
GMAT Club Tests

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If x and y are positive, is x^3>y? (1) sqrt x > y (2)

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
VP
VP
avatar
Joined: 06 Jun 2004
Posts: 1059
Location: CA
Followers: 2

Kudos [?]: 55 [0], given: 0

If x and y are positive, is x^3>y? (1) sqrt x > y (2) [#permalink] New post 22 May 2006, 22:07
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If x and y are positive, is x^3>y?

(1) sqrt x > y
(2) x > y
_________________

Don't be afraid to take a flying leap of faith.. If you risk nothing, than you gain nothing...

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

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

 [#permalink] New post 22 May 2006, 22:45
Answer E

1 is not sufficient.

The first equation can be written as x> y^2
lets say x=1/2 and y=1/2. this satisfies the equation above. But x^3 = 1/8 and y=1/2. Hence x^3 is not greater than y
Say x =2 and y =2, Satisifies (1) but x^3 = 8 and y= 2, hence x^3> y
We cannot give the answer with certainty

2 is not sufficent.

Say X =1/2 and Y =1/4, satisfies (2), but x^3 < y
Say X=2 and Y=1 , satisfies (2) but X^3 > y

Both together also are not sufficient hence E
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jul 2004
Posts: 5067
Location: Singapore
Followers: 24

Kudos [?]: 202 [0], given: 0

 [#permalink] New post 22 May 2006, 23:06
St1:
If x = 16, y = 2,then x^3 > y

If x = 1/4, y = 1/3, then x^3 < y.

Insufficient.

St2:
x > y
Insufficient. If x = 2, y = 1, x^3 > y. If x = 1/2, y = 1/3, x^3 < y.

Using St1 and St2:
If x = 2, y = 1, sqrt(x) > y and x > y, x^3 > y

If x = 1/2, y = 1/3, sqrt(1/2) > y and x > y, x^3 < y

Insufficient.

Ans E
Manager
Manager
avatar
Joined: 10 May 2006
Posts: 186
Location: USA
Followers: 1

Kudos [?]: 3 [0], given: 0

 [#permalink] New post 23 May 2006, 07:18
Agree with the explanations. The key is to substitute fractions into the equations.
VP
VP
avatar
Joined: 06 Jun 2004
Posts: 1059
Location: CA
Followers: 2

Kudos [?]: 55 [0], given: 0

 [#permalink] New post 23 May 2006, 18:17
Great job guys, OA is E
_________________

Don't be afraid to take a flying leap of faith.. If you risk nothing, than you gain nothing...

  [#permalink] 23 May 2006, 18:17
Display posts from previous: Sort by

If x and y are positive, is x^3>y? (1) sqrt x > y (2)

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

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®.