• Board contributors include instructors with "800" GMAT scores.
  • 95% of posts have replies within 24 hours.
  • Join for discounts with 800score, VeritasPrep and ManhattanGMAT

FAQ  - Register  - Search - Login 

All times are UTC - 7 hours

Post new topic Reply to topic  [ 2 posts ] 
Author Message
 Post subject: GMAT Algebra (Data Sufficiency)
PostPosted: Sun Sep 13, 2009 6:08 pm 

Joined: Sun Apr 19, 2009 6:56 pm
Posts: 32
The three integers in the set {x, y, z} are all less than 30. How many of the integers are positive?
(1) x + y + z = 67
(2) x + y = 35

This question is a little confusing. Although Statement (2) is insufficient either way, when Statement (1) and Statement (2) are taken together, z can be calculated as (35) + z = 67, or z = 32. This appears to contradict the constraint defined in the problem that all three integers must be less than 30. I'm not sure if this is a typo, but I wasted a lot of time rereading the problem to make sure I wasn't missing anything.

 Post subject: Re: Test 4, Question 16
PostPosted: Sun Sep 13, 2009 6:10 pm 
User avatar

Joined: Mon Apr 06, 2009 5:44 pm
Posts: 81
Don't forget that integers are positive and negative whole number, and zero. So, it is entirely possible that some of the numbers are negative.

Statement (1) alone is sufficient. Since all the numbers are less than 30, all three must be positive for their sum to be 60 or greater because there is no way to get a sum greater than or equal to 60 with just two of positive numbers less than 30

Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC - 7 hours

Who is online

Users browsing this forum: No registered users and 3 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Template made by DEVPPL -
GMAT(TM) and GMAT CAT (TM) are registered trademarks of the Graduate Management Admission Council(TM). The Graduate Management Admission Council(TM) does not endorse, nor is affiliated in any way with the owner or any content of this site.