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

It is currently 25 Aug 2016, 21:23
GMAT Club Tests

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

If x and y are positive integers such that x=8y+12, what is

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Director
Director
avatar
Joined: 21 Aug 2005
Posts: 793
Followers: 2

Kudos [?]: 23 [0], given: 0

If x and y are positive integers such that x=8y+12, what is [#permalink]

Show Tags

New post 21 Oct 2005, 23:21
00:00
A
B
C
D
E

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.

If x and y are positive integers such that x=8y+12, what is the greatest common divisor of x and y?
a) x=12u, u is an integer
b) y=12z, z is an integer
Director
Director
avatar
Joined: 13 Nov 2003
Posts: 790
Location: BULGARIA
Followers: 1

Kudos [?]: 44 [0], given: 0

 [#permalink]

Show Tags

New post 22 Oct 2005, 01:50
x=8y+12 and x=12u then 12u=8y+12 or y=[12*(u-1)]/8 or y=[3*(u-1)]/2 since u ia an integer when u=1 y=0 x=12 the greatest GCD is 12 when u=3,y=3 x=36 GCD is 3 so A) is insuff
Same reasoning can be applied to B)
Even when combined A) and B) are not enough So E) is my choice
Current Student
avatar
Joined: 28 Dec 2004
Posts: 3385
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 14

Kudos [?]: 257 [0], given: 2

 [#permalink]

Show Tags

New post 22 Oct 2005, 08:57
this is B

(1) well 12u=8y+12

OK so xis a multiple of 12...

lets if y=0, then x=12...then GCD=0

if y=3, x=36, GCD=3, y=6, x=60, GCD=6...Insuff

(2)
x=8(12z)+12 well, what does this mean; it means X and Y both are multiples of 12....therefor GCD will be 12...i.e. say y=12 and x=8.12+12, GCD=12...say y=24 x=8.24+12...GCD=12

Sufficient
  [#permalink] 22 Oct 2005, 08:57
Display posts from previous: Sort by

If x and y are positive integers such that x=8y+12, what is

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| 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®.