It is currently 21 Oct 2017, 02:02

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.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

GmatPrep #1 - LCM

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
User avatar
Joined: 19 Aug 2006
Posts: 239

Kudos [?]: 13 [0], given: 0

GmatPrep #1 - LCM [#permalink]

Show Tags

New post 03 Mar 2009, 19:55
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Guys, I hit a mental roadblock. :|
Could someone please help with this one, with explanation?

I'll post the OA later.
Attachments

q1.jpg
q1.jpg [ 145.83 KiB | Viewed 1174 times ]

Kudos [?]: 13 [0], given: 0

Manager
Manager
User avatar
Joined: 17 Dec 2008
Posts: 171

Kudos [?]: 169 [0], given: 0

Re: GmatPrep #1 - LCM [#permalink]

Show Tags

New post 03 Mar 2009, 21:13
From (1) x,6 LCM=30 => x =5,10, or 30. Multiple values of x.
From (2) x,9 LCM=45 => x =5,9, or 45. Multiple values of x.

From (1) and (2) => x =5.

Hence (C).

Kudos [?]: 169 [0], given: 0

Manager
Manager
User avatar
Joined: 19 Aug 2006
Posts: 239

Kudos [?]: 13 [0], given: 0

Re: GmatPrep #1 - LCM [#permalink]

Show Tags

New post 03 Mar 2009, 21:47
ConkergMat wrote:
From (1) x,6 LCM=30 => x =5,10, or 30. Multiple values of x.
From (2) x,9 LCM=45 => x =5,9, or 45. Multiple values of x.

From (1) and (2) => x =5.

Hence (C).


OK, so I'm not crazy or dead tired from solving endless problems.
I get the same answer as you, but the OA is different: :|

From (1) x,6 LCM=30 => x =5,10, 15 or 30. Multiple values of x.
From (2) x,9 LCM=45 => x =5,9, or 45. Multiple values of x.
From combining (1) and (2), only 5 is in both, so x-5.

I wonder, could it be that GmatPrep is WRONG??? :P

Kudos [?]: 13 [0], given: 0

1 KUDOS received
Senior Manager
Senior Manager
avatar
Joined: 30 Nov 2008
Posts: 485

Kudos [?]: 361 [1], given: 15

Schools: Fuqua
Re: GmatPrep #1 - LCM [#permalink]

Show Tags

New post 03 Mar 2009, 22:21
1
This post received
KUDOS
Looks like you are trying to figure out what is the value of x?

But the question being asked is what is the LCM of x, 6 and 9.

From Stmt 1 : LCM of X and 6 is 30 ==> X will have 5 as prime factor and primes factors 2 and 3 can have at the exponents 0 or 1. So X can be 5 or 10 or 15 or 30. Irrespective of what X is, LCM of X, 6 and 9 will be the same. Hence Sufficient.

From Stmt2 : LCM of X and 9 is 45 ==> X will have 5 as prime factor and other prime number 3 can have the exponents from 0 thru 2. So X can be 5, 15, 45. Irrespective of what X is, LCM of X, 6 and 9 will be the same. Hence Sufficient.

IMO D.

Kudos [?]: 361 [1], given: 15

Manager
Manager
User avatar
Joined: 19 Aug 2006
Posts: 239

Kudos [?]: 13 [0], given: 0

Re: GmatPrep #1 - LCM [#permalink]

Show Tags

New post 04 Mar 2009, 07:36
The OA is D.
Thanks, everyone.

mrsmarthi, thank you - it's a sign I need some break... :lol:

Kudos [?]: 13 [0], given: 0

Re: GmatPrep #1 - LCM   [#permalink] 04 Mar 2009, 07:36
Display posts from previous: Sort by

GmatPrep #1 - LCM

  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 | Emoji artwork provided by EmojiOne

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®.