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# Gmat prep DS - LCM

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Manager
Joined: 20 Mar 2005
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Gmat prep DS - LCM [#permalink]

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06 Aug 2007, 05:41
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Intern
Joined: 11 May 2005
Posts: 13

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Location: Pennsylvania, United States

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06 Aug 2007, 06:10
Ans: C

Sentence 1 tells us the LCM of x/y and 1/3 but don't know what the value of x is, if it's multiple of y then we can't use this information reliably. So using what Sentence 2 tell us, we can find the value of y (= 2, btw).

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Director
Joined: 15 Jun 2007
Posts: 504

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06 Aug 2007, 09:31
E for me

if the LCM is 6 then couldn't Y be 2 or 6?

(x/y) and (1/3) is 6

St 2

(1/x) and (1/3) then if the LCD is 6 couldn't x be 2 or 6

x=6, then LCM is 3*2 = 6
x=2, then LCM is 3*2 = 6

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VP
Joined: 09 Jul 2007
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Location: London

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07 Aug 2007, 07:23
since it is asking for a certain value, u cannot decide based on the data, it is not sufficient,
when a question like those ask for certain values, the answer should be exact value if the equation is solved

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Director
Joined: 12 Jul 2007
Posts: 857

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07 Aug 2007, 08:13
Quote:
(1/x) and (1/3) then if the LCD is 6 couldn't x be 2 or 6

I think this is why it's E instead of C. I agree with this logic.

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07 Aug 2007, 08:13
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