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

It is currently 27 Jan 2015, 20:21

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

DS: Difficult question- help needs.

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 16 May 2004
Posts: 3
Location: Korea
Followers: 0

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

DS: Difficult question- help needs. [#permalink] New post 08 Aug 2004, 22:52
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Hi,

Any idea for the following question ? What's correct answer and explain ?

DS: If (r+t)/(r-t) > 0, r>t is true ?
1) t>0
2) r>0

[/b]
Joined: 31 Dec 1969
Location: United States
Concentration: General Management, Strategy
GMAT 1: 710 Q49 V0
GPA: 3.6
WE: Accounting (Accounting)
Followers: 0

Kudos [?]: 79 [0], given: 83233

 [#permalink] New post 08 Aug 2004, 23:07
I think it is C.

(r+t)/(r-t)>0

(1) t>0 -->
with (r+t)>0 & (r-t)>0 <--> r> - t & r> t --> r>t

OR (r+t)<0 & (r-t)<0 <--> r<-t & r<t ---> r< t

So (1) is insufficient.

(2) r>0 -->
with (r+t)>0 & (r-t) > 0 <--> r > - t & r> t

or (r+t)<0 & (r-t)<0 <--> r < -t & r<t

So (2) is insufficient

(1) & (2) --> with (r+t)>0 & (r-t)> 0 --> r>t
or (r+t)<0 & (r-t)<0 --> impossible cos r+t always > 0

---> sufficient

So the ans is C
Director
Director
avatar
Joined: 20 Jul 2004
Posts: 593
Followers: 1

Kudos [?]: 40 [0], given: 0

 [#permalink] New post 09 Aug 2004, 00:42
b?

Given: r+t/r-t>0
Question: r>t?

For r+t/r-t to be positive,
-> Option 1: r is postive and > t
OR
-> Option 2: r is negative and < t

The fact that t is greater than zero (St: 1) doesn't do much help, since it is subtracted in denominator.
The fact that r is greater than zero (St: 2) removes option 2 and assures r>t

took more than 2 minutes though :cry:
Manager
Manager
avatar
Joined: 02 Jul 2004
Posts: 218
Followers: 1

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

 [#permalink] New post 09 Aug 2004, 02:57
1) if both t and r are positive, then r>t
but if t>0 and r is a big negative then r<t
NOT SUFFICIENT

2) if r>0 then it is impossible that r<t because this would make (r+t)/(r-t) negative. Hence, it must be r>t. SUFFICIENT

Therefore, B
Manager
Manager
avatar
Joined: 19 Jun 2003
Posts: 151
Followers: 1

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

 [#permalink] New post 09 Aug 2004, 07:37
very good question..thanks for posting.
GMAT Club Legend
GMAT Club Legend
avatar
Joined: 15 Dec 2003
Posts: 4315
Followers: 24

Kudos [?]: 195 [0], given: 0

 [#permalink] New post 09 Aug 2004, 08:05
Yes, good question. I got B also by plugging in numbers. Took about 2 min.
_________________

Best Regards,

Paul

Manager
Manager
User avatar
Joined: 28 Jul 2004
Posts: 182
Followers: 1

Kudos [?]: 6 [0], given: 0

 [#permalink] New post 09 Aug 2004, 16:25
nice question. I was tempted to go on with C. B is my choice too
  [#permalink] 09 Aug 2004, 16:25
    Similar topics Author Replies Last post
Similar
Topics:
Need help regard to DS questions ...? sag 1 25 May 2010, 22:24
difficult DS dragonball20cal 4 17 Jun 2007, 19:00
2 Several difficult PS and DS questions!!! eribold 22 15 Feb 2007, 10:24
Need help with DS Beerster 2 01 Jan 2006, 14:33
Help Needed for DS question Yogendras 1 29 Dec 2005, 22:59
Display posts from previous: Sort by

DS: Difficult question- help needs.

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

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®.