It is currently 24 Sep 2017, 01:52

### 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

# gmat prep DS - mode

Author Message
Manager
Joined: 20 Mar 2005
Posts: 169

Kudos [?]: 91 [0], given: 0

gmat prep DS - mode [#permalink]

### Show Tags

25 Jun 2007, 06:15
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.

Attachments

Slide6.JPG [ 24.07 KiB | Viewed 1021 times ]

Kudos [?]: 91 [0], given: 0

Senior Manager
Joined: 28 Feb 2007
Posts: 300

Kudos [?]: 42 [0], given: 0

### Show Tags

25 Jun 2007, 07:17
There are at least 2 different approaches to this problem,
but as to me the best one is PICKing some #s.

1-method)
try x=5,y=2,z=7 and x=-5 , y=7 , z=2 for statement 1 to see
/x/=y-z

2-method)

from the rule of modul:
/x/=y-z then
a) if x>0 then x= y-z or
b) if x<o then x=-(y-z) =z-y so statements 1+2 togather includes
second option (b) completely. Tharefore C

Last edited by UMB on 25 Jun 2007, 12:23, edited 1 time in total.

Kudos [?]: 42 [0], given: 0

CIO
Joined: 09 Mar 2003
Posts: 463

Kudos [?]: 68 [0], given: 0

Re: gmat prep DS - mode [#permalink]

### Show Tags

25 Jun 2007, 09:42
Balvinder wrote:

The first statement says that x + y = z. So x = z - y.

If x is positive, the |x| is also z - y, because nothing changes. If x is negative, then |x| = y - z, because you have to change the sign to make it go positive. Since you don't know about x, you can't know which is right.

Two doesn't say anything on its own, but together, we know that x is negative, so it must be that |x| = y - z.

C

Kudos [?]: 68 [0], given: 0

Re: gmat prep DS - mode   [#permalink] 25 Jun 2007, 09:42
Display posts from previous: Sort by