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

It is currently 22 Sep 2014, 10:43

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 product 2*x*5*y an even integer? a. 2 + x + 5 + y is an

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
1 KUDOS received
SVP
SVP
avatar
Joined: 04 May 2006
Posts: 1941
Schools: CBS, Kellogg
Followers: 17

Kudos [?]: 286 [1] , given: 1

Premium Member CAT Tests
Is product 2*x*5*y an even integer? a. 2 + x + 5 + y is an [#permalink] New post 23 May 2008, 01:18
1
This post received
KUDOS
Is product 2*x*5*y an even integer?

a. 2 + x + 5 + y is an even integer
b. x - y is an odd integer
_________________

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Expert Post
CEO
CEO
User avatar
Joined: 17 Nov 2007
Posts: 3571
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 364

Kudos [?]: 1798 [0], given: 358

GMAT ToolKit User GMAT Tests User Premium Member
Re: M16-18 [#permalink] New post 23 May 2008, 01:42
Expert's post
I guess it is C.

1. 2*x*5*y is always even integer if x and y are integers. But for non integers, for example,x=1/3, y=1/3, the expression will not be an integer.

2. the first condition: 2 + x + 5 + y is an even integer if only x+y is an odd integer. Again, x=4/3 and y=2/3 make the result of the expression non integer value.

3. the second condition: x=4/3 and y=1/3 make the result of the expression non integer value.

4. two conditions. It is obviously that x+y and x-y can be integers only if non integers are x=a+0.5, y=b+0.5. (a and b are integers)

So, 1-st condition: x+y=a+b+1 is odd or a+b is even; 2-nd condition: a-b is odd. For any a,b It is impossible to satisfy both conditions if x or y are non integers. Therefore, C.
_________________

HOT! GMAT TOOLKIT 2 (iOS) / GMAT TOOLKIT (Android) - The OFFICIAL GMAT CLUB PREP APP, a must-have app especially if you aim at 700+ | PrepGame

1 KUDOS received
Manager
Manager
avatar
Joined: 11 Apr 2008
Posts: 157
Schools: Kellogg(A), Wharton(W), Columbia(D)
Followers: 1

Kudos [?]: 55 [1] , given: 0

Re: M16-18 [#permalink] New post 23 May 2008, 04:33
1
This post received
KUDOS
walker wrote:
I guess it is C.

1. 2*x*5*y is always even integer if x and y are integers. But for non integers, for example,x=1/3, y=1/3, the expression will not be an integer.

2. the first condition: 2 + x + 5 + y is an even integer if only x+y is an odd integer. Again, x=4/3 and y=2/3 make the result of the expression non integer value.

3. the second condition: x=4/3 and y=1/3 make the result of the expression non integer value.

4. two conditions. It is obviously that x+y and x-y can be integers only if non integers are x=a+0.5, y=b+0.5. (a and b are integers)

So, 1-st condition: x+y=a+b+1 is odd or a+b is even; 2-nd condition: a-b is odd. For any a,b It is impossible to satisfy both conditions if x or y are non integers. Therefore, C.


Good expl. I agree.
Re: M16-18   [#permalink] 23 May 2008, 04:33
    Similar topics Author Replies Last post
Similar
Topics:
9 Experts publish their posts in the topic Is product 2*x*5*y an even integer? nglekel 13 22 Feb 2012, 06:33
7 Experts publish their posts in the topic Is product 2*x*5*y an even integer? prinits 12 29 May 2009, 03:53
Is product 2*x*5*y an even integer? a.) 2 + x + 5 + y is an arjtryarjtry 4 02 Aug 2008, 02:17
Is product 2*x*5*y an even integer? 1. 2 + x + 5 + y is an marcodonzelli 5 02 Mar 2008, 03:22
Display posts from previous: Sort by

Is product 2*x*5*y an even integer? a. 2 + x + 5 + y is an

  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®.