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

It is currently 27 Jul 2014, 20:51

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

variables - ds

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 11 Jan 2008
Posts: 54
Followers: 0

Kudos [?]: 13 [0], given: 0

variables - ds [#permalink] New post 04 Jan 2009, 22:16
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Attachment:
varibles-ds.GIF
varibles-ds.GIF [ 2.08 KiB | Viewed 483 times ]



can the q be re-written as : |x - y| = |z| - |x| ??

doesnt stmt 1 is exactly what is given to us...

zy < xy < 0 which is z < x < 0

i know there is a rule that u cannot divide or multiply an inequality by a varible unless u know the sign..

so confused....
SVP
SVP
avatar
Joined: 17 Jun 2008
Posts: 1580
Followers: 12

Kudos [?]: 176 [0], given: 0

GMAT Tests User
Re: variables - ds [#permalink] New post 04 Jan 2009, 22:31
"zy < xy < 0 which is z < x < 0" will be true only if y > 0.

However, xy > zy or, (x-z)y > 0
That means either (x-z) > 0 and y > 0
or, (x-z) < 0 and y < 0.

Both stmt1 and 2 tell that (x-z) > 0 and y > 0
Also, if y > 0 then x < 0 and z < 0.

Hence, |x-z| + |x| = x - z - x = -z = |z|

Hence, D.
Manager
Manager
avatar
Joined: 11 Jan 2008
Posts: 54
Followers: 0

Kudos [?]: 13 [0], given: 0

Re: variables - ds [#permalink] New post 06 Jan 2009, 17:33
Just want to make sure i got this one correct,,,

Q : |x - z| + |x| = |z| ??
Given : zy < xy < 0

which can be written as xy-zy > 0 --> y(x-z) > 0
From above either y > 0 then (x-z) > 0 or y <0 or (x-z) <0

So we dont know which to take..?

From 1 we get , z < x --> x - z > 0 so y >0 and from that x < 0, z < 0..
|x - z| + |x| = |z|
x - z - x = -z hence true (A suff..)

Similarly, we can prove from B...

Does both stmts suff....(D).

Is this considered to be a 500 - 600 level q on gmat?
Re: variables - ds   [#permalink] 06 Jan 2009, 17:33
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic d/s variables 2 Lolaergasheva 4 08 Mar 2011, 22:56
1 d/s variables Lolaergasheva 1 08 Mar 2011, 22:07
Variables study 5 24 Dec 2008, 06:02
DS: variables Hermione 1 29 Oct 2006, 09:08
variables ds joemama142000 5 31 Jan 2006, 19:39
Display posts from previous: Sort by

variables - ds

  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®.