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

It is currently 24 Aug 2016, 22:31
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

Is rs = rx -2? (1) r is an odd number (2) x = s +2 Pls

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
Joined: 15 Oct 2008
Posts: 108
Followers: 1

Kudos [?]: 7 [0], given: 0

Is rs = rx -2? (1) r is an odd number (2) x = s +2 Pls [#permalink]

Show Tags

New post 31 Oct 2008, 09:17
00:00
A
B
C
D
E

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.

Is rs = rx -2?
(1) r is an odd number
(2) x = s +2

Pls explain your answer.
Thanks
Current Student
avatar
Joined: 28 Dec 2004
Posts: 3385
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 14

Kudos [?]: 257 [0], given: 2

Re: DS - is rs = rx-2? [#permalink]

Show Tags

New post 31 Oct 2008, 09:36
nganle08 wrote:
Is rs = rx -2?
(1) r is an odd number
(2) x = s +2

Pls explain your answer.
Thanks



r=-2/(s-x) which means if r is odd only possibility is s-x=-2 or 2 or -2/3 or 2/3 etc, which implies r=1 or -1

rs+2=rx, so if r is odd..we dont know the value of x or s..so 1) is insuff

2) x=s+2; rs=r(s+2)-2 rs-rs=2r-2 or 2r-2=0 which is only true if r=1...

we dont know anything about r..

1+2 together we know that r=odd, i.e 1..or 3 or 5 we dont know

E it is
Manager
Manager
avatar
Joined: 15 Oct 2008
Posts: 108
Followers: 1

Kudos [?]: 7 [0], given: 0

Re: DS - is rs = rx-2? [#permalink]

Show Tags

New post 31 Oct 2008, 10:49
fresinha12 wrote:
nganle08 wrote:
Is rs = rx -2?
(1) r is an odd number
(2) x = s +2

Pls explain your answer.
Thanks



r=-2/(s-x) which means if r is odd only possibility is s-x=-2 or 2 or -2/3 or 2/3 etc, which implies r=1 or -1

rs+2=rx, so if r is odd..we dont know the value of x or s..so 1) is insuff

2) x=s+2; rs=r(s+2)-2 rs-rs=2r-2 or 2r-2=0 which is only true if r=1...

we dont know anything about r..

1+2 together we know that r=odd, i.e 1..or 3 or 5 we dont know

E it is


Thanks. I do not have the OA for this but I seem to agree with E and agree with your explanation. Does anyone have different opinion?
SVP
SVP
User avatar
Joined: 05 Jul 2006
Posts: 1512
Followers: 5

Kudos [?]: 240 [0], given: 39

GMAT ToolKit User
Re: DS - is rs = rx-2? [#permalink]

Show Tags

New post 31 Oct 2008, 11:28
[quote="nganle08"]Is rs = rx -2?
(1) r is an odd number
(2) x = s +2

is r(s-x) = -2

from one insuff

from 2

is r(s-s-2) = -2r ie: is r = 1

insuff

both

insuff
too

E
SVP
SVP
User avatar
Joined: 29 Aug 2007
Posts: 2492
Followers: 66

Kudos [?]: 692 [0], given: 19

Re: DS - is rs = rx-2? [#permalink]

Show Tags

New post 31 Oct 2008, 15:16
rs = rx -2 ?
rx - rs = 2 ?
r (x - s) = 2 ?

1: r is an odd number. nsf..

2: x = s + 2
x - s = 2
nsf.

togather: only possible if r = 1 (or -1 as well, i guess).
E.


yezz wrote:
nganle08 wrote:
Is rs = rx -2?
(1) r is an odd number
(2) x = s +2

is r(s-x) = -2

from one insuff
from 2: is r(s-s-2) = -2r ie: is r = 1
insuff

both: insuff too

E


How did you get r = 1?

We do not know whether rs = rx - 2? This is waht we have to proove.
_________________

Verbal: http://gmatclub.com/forum/new-to-the-verbal-forum-please-read-this-first-77546.html
Math: http://gmatclub.com/forum/new-to-the-math-forum-please-read-this-first-77764.html
Gmat: http://gmatclub.com/forum/everything-you-need-to-prepare-for-the-gmat-revised-77983.html


GT

Re: DS - is rs = rx-2?   [#permalink] 31 Oct 2008, 15:16
Display posts from previous: Sort by

Is rs = rx -2? (1) r is an odd number (2) x = s +2 Pls

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| 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®.