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

It is currently 23 Oct 2014, 05:34

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

DS:Greatest common factor & least common multiple(gmatpr

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 12 Jul 2006
Posts: 67
Location: Boston
Followers: 1

Kudos [?]: 5 [0], given: 0

DS:Greatest common factor & least common multiple(gmatpr [#permalink] New post 16 Jul 2006, 11:20
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Could you please help me with this problem

If x and y are positive integers, what is the value of xy?

a) The greatest common factor of x and y is 10
b) The least common multiple of x and y is 180

Thanks
_________________

Good is the greatest enemy of great.

Manager
Manager
avatar
Joined: 04 Jul 2006
Posts: 57
Followers: 1

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

 [#permalink] New post 16 Jul 2006, 12:18
C.

Each statement alone is not sufficient (pretty obvious).

Both statements together are sufficient. x=10 and y=180 are the only numbers that fulfill both properties.
(1) states that 10 is a common factor (and that it is the largest common factor). Therefore x and y must be multiples of 10.

Because of (2) we need to consider the factors of 180, that are multiples of 10. These are 10, 30, 60, 90 and 180. The least common multiple of two of these numbers is always lower than 180, except for 10 and 180 (easy to check) .

Therefore only 10 and 180 fulfill both properties.
Manager
Manager
avatar
Joined: 04 Jul 2006
Posts: 57
Followers: 1

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

 [#permalink] New post 16 Jul 2006, 12:37
Quote:
HCF (x, y) * LCM (x, y) = x * y


... true.

Nice formula - thanks!
Manager
Manager
avatar
Joined: 12 Jul 2006
Posts: 67
Location: Boston
Followers: 1

Kudos [?]: 5 [0], given: 0

 [#permalink] New post 17 Jul 2006, 08:13
Thank you guys. C is the correct answer.
_________________

Good is the greatest enemy of great.

  [#permalink] 17 Jul 2006, 08:13
    Similar topics Author Replies Last post
Similar
Topics:
1 DS - Common Factor IEsailor 4 10 May 2011, 03:03
greatest common factor cul3s 2 15 Jan 2009, 23:29
3 Greatest Common Factor tarek99 1 19 Nov 2007, 06:21
Greates common factor in DS kaitibruck 2 07 Oct 2006, 12:05
ds:greatest common factor macca 3 11 Apr 2006, 04:17
Display posts from previous: Sort by

DS:Greatest common factor & least common multiple(gmatpr

  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®.