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# GmatPrep #1 - LCM

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Manager
Joined: 19 Aug 2006
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GmatPrep #1 - LCM [#permalink]

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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.

I'll post the OA later.
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Manager
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Re: GmatPrep #1 - LCM [#permalink]

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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).

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Manager
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Re: GmatPrep #1 - LCM [#permalink]

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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???

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

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03 Mar 2009, 22:21
1
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.

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Manager
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Re: GmatPrep #1 - LCM [#permalink]

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

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

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Re: GmatPrep #1 - LCM   [#permalink] 04 Mar 2009, 07:36
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# GmatPrep #1 - LCM

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