It is currently 28 Jun 2017, 04:26

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

(r+t)/(r-t)>0. r>t? (1) t>0 (2) r>0

Author Message
Intern
Joined: 22 May 2004
Posts: 4
Location: Japan
(r+t)/(r-t)>0. r>t? (1) t>0 (2) r>0 [#permalink]

Show Tags

17 Jun 2004, 00:32
00:00

Difficulty:

(N/A)

Question Stats:

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

HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

(1) t>0
(2) r>0

Last edited by sweetlife on 17 Jun 2004, 05:14, edited 1 time in total.
Senior Manager
Joined: 25 Dec 2003
Posts: 359
Location: India

Show Tags

17 Jun 2004, 00:56
Answer is C. Combing both we wud get to know that r>t.

If r is less that t then the denominator will result in negetive value, which in turn wud not satisfy more than 0.

Regards

Correct me if i am wrong.
_________________

Giving another SHOT

Intern
Joined: 22 May 2004
Posts: 4
Location: Japan

Show Tags

17 Jun 2004, 03:11
It says the answer is B and it doesnt convince me.
I am seeking the answer myself. It looks like C.
Senior Manager
Joined: 25 Dec 2003
Posts: 359
Location: India

Show Tags

17 Jun 2004, 04:46
(r+t)/(r-t)>0. r>t?

(1) t>0
(2) r>0

Pardon me for the wrong answer given last time. The answer is indeed B.

Only in the case of R>0 would the equation (r+t)/(r-t)>0. r>t be satisfied. If r is less than 0, then the equation may result is either case. If R>0, then if t is more than r then, the original equation will not be satisfied. I had checked this with number subs .. for any value of R more than 0, the equation to be valid, t shoud be less than r.

Sorry for causing the confusion.
Regards
_________________

Giving another SHOT

Senior Manager
Joined: 07 Oct 2003
Posts: 350
Location: Manhattan

Show Tags

24 Jun 2004, 10:48
sweetlife wrote:
Thanks. B it is...

This is probably a case where I just don't see the obviuos answer, but I think it's D:

1) t >0

let's say t=4, then we have

(r+4)/(r-4)>0

r has to be greater than 4, b/c otherwise the answer would yield a negative answer.
Say r is 3, then we have 7/-1=-7 which is not greater than 0

what am I missing?
Senior Manager
Joined: 25 Dec 2003
Posts: 359
Location: India

Show Tags

26 Jun 2004, 08:49
Hi Lastocka

You have made a mistake here. If r is less than t, then the original equation does not stand good. Taking your case, you have mentioned, if r=3, then the orginal equation (r+4)/(r-4)>0 will be less than 0. But we are not suppose to change the orginal equation in here.

I hope it is clear now.

Regards
_________________

Giving another SHOT

Manager
Joined: 07 May 2004
Posts: 183
Location: Ukraine, Russia(part-time)

Show Tags

27 Jun 2004, 01:00
sweetlife wrote:
(r+t)/(r-t)>0. r>t?

(1) t>0
(2) r>0

(r+t)/(r-t) = 1 + 2t/(r-t) > 0 => t > 0, r = -1.01*t. => 1 is not sufficient.

2 is sufficient because from (r+t)/(r-t) > 0 and r > 0 => -r < t < r.
Manager
Joined: 10 Jun 2004
Posts: 83

Show Tags

27 Jun 2004, 13:17
sweetlife wrote:
(r+t)/(r-t)>0. r>t?

(1) t>0
(2) r>0

I have a different answer, I will go with A

If t>0, take as an example t=1 and r=3. in this case the result will be (3+1)/(3-1) =2>0 sufficient

But if r>0 this do not mean that t must be positive it could be any number less than r. for example, r=2 t=-4
(2-4)/(2+4)=-2/6 . In other cases the result will be poistive. hence, Insufficient.

Correct me if I am wrong.

good luck all
Manager
Joined: 07 May 2004
Posts: 183
Location: Ukraine, Russia(part-time)

Show Tags

27 Jun 2004, 22:57
dr_sabr wrote:
sweetlife wrote:
(r+t)/(r-t)>0. r>t?

(1) t>0
(2) r>0

I have a different answer, I will go with A

If t>0, take as an example t=1 and r=3. in this case the result will be (3+1)/(3-1) =2>0 sufficient

But if r>0 this do not mean that t must be positive it could be any number less than r. for example, r=2 t=-4
(2-4)/(2+4)=-2/6 . In other cases the result will be poistive. hence, Insufficient.

Correct me if I am wrong.

good luck all

No, dr_sabr, it is wrong. Look, the stem SHOULD be always true, and in your example it is not satisfied! But it should be!
Manager
Joined: 10 Jun 2004
Posts: 83

Show Tags

28 Jun 2004, 02:39
I didn't understand what you meant

I will take 1) first.
If t>0, take as an example t=1 and r=3. in this case the result will be (3+1)/(3-1) =2>0 sufficient. because whatever is t, r must be >t.

2) But if r>0 this do not mean that t must be positive it could be any number less than r. for example, r=2 t=-4 =>(2-4)/(2+4)=-2/6 . In another case if r=3 t=2 =>(3+2)/(3-2)=5>0 . hence, Insufficient

Correct me if I am mistaken .
_________________

-Genius is one percent inspiration, and ninety-nine percent perspiration.

Manager
Joined: 07 May 2004
Posts: 183
Location: Ukraine, Russia(part-time)

Show Tags

28 Jun 2004, 02:55
dr_sabr wrote:
2) But if r>0 this do not mean that t must be positive it could be any number less than r.

NOT any number less than r, but any number, for which the STEM is true! i.e., for which (r+t)/(r-t) > 0. But in your example this is not the case: r = 2, t = -4 and (r+t)/(r-t) = -1/3 < 0 and this contradicts the stem!!!

dr_sabr wrote:
for example, r=2 t=-4 =>(2-4)/(2+4)=-2/6 . In another case if r=3 t=2 =>(3+2)/(3-2)=5>0 . hence, Insufficient

Correct me if I am mistaken .
Manager
Joined: 10 Jun 2004
Posts: 83

Show Tags

28 Jun 2004, 04:25
Emmanuel wrote:
But in your example this is not the case: r = 2, t = -4 and (r+t)/(r-t) = -1/3 < 0 and this contradicts the stem!!!

I think that I misunderstood this question, I thought the stem was r>t . Thank you Emmanuel for correcting me. I hope I don't make this mistake on the test.
_________________

-Genius is one percent inspiration, and ninety-nine percent perspiration.

Manager
Joined: 07 May 2004
Posts: 183
Location: Ukraine, Russia(part-time)

Show Tags

28 Jun 2004, 04:37
dr_sabr wrote:
Emmanuel wrote:
But in your example this is not the case: r = 2, t = -4 and (r+t)/(r-t) = -1/3 < 0 and this contradicts the stem!!!

I think that I misunderstood this question, I thought the stem was r>t . Thank you Emmanuel for correcting me. I hope I don't make this mistake on the test.

I hope that you will do such questions easily on the test, once you have seen what problems can arise here.
28 Jun 2004, 04:37
Display posts from previous: Sort by

(r+t)/(r-t)>0. r>t? (1) t>0 (2) r>0

 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®.