It is currently 23 Jun 2017, 07:27

### 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

# HARD DS Number Properties:(

Author Message
Manager
Joined: 08 May 2004
Posts: 158
Location: Pittsburgh

### Show Tags

06 Aug 2006, 15:37
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions

### HideShow timer Statistics

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

Help....
Attachments

hardds.jpg [ 111.66 KiB | Viewed 683 times ]

Director
Joined: 07 Jun 2004
Posts: 612
Location: PA

### Show Tags

06 Aug 2006, 16:47
I would go with A

if we solve it we get

x = z - y

or

- x = y - z

that means y - x = - x NOT | X | so A is good

whats the OA
Manager
Joined: 26 Jun 2006
Posts: 152

### Show Tags

06 Aug 2006, 17:20
It should be (C)

If x<0, the main expression becomes -x=y-z, or x+y=z (which copies ST1)
However, if x>=0, we open it up as x=y-z, or z=y-x.

So, ST1 is not suff

ST2 does not give us much, only that x<0. So, not suff.

But after we combine ST1 and ST2, we know that if x<0 and x+y=z is true, the main expression must also be true.

So, (C)
Manager
Joined: 08 May 2004
Posts: 158
Location: Pittsburgh

### Show Tags

06 Aug 2006, 17:57
RX,

See that is what I did, I solved and got A
That was my mistake too
06 Aug 2006, 17:57
Display posts from previous: Sort by

# HARD DS Number Properties:(

 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®.