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Re: If 144/x is an integer and 108/x is an integer, which... [#permalink]

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15 Mar 2012, 03:28

Hi,

I didnt get this one. The q askes for which one of the following is an integer. So i plugged in nos. to see, and found that each option is has divisors. On what basis is the answer 36 as d qustn askes for "is an integer" and not greatest factor?

Re: If 144/x is an integer and 108/x is an integer, which... [#permalink]

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15 Mar 2012, 03:38

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This post received KUDOS

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priyalr wrote:

Hi,

I didnt get this one. The q askes for which one of the following is an integer. So i plugged in nos. to see, and found that each option is has divisors. On what basis is the answer 36 as d qustn askes for "is an integer" and not greatest factor?

Pls explain, Thnx

If 144/x is an integer and 108/x is an integer, which of the following must be true?

I. 9/x is an integer II. 12/x is an integer III. 36/x is an integer

A. I only B. III only C. I and II only D. II and III only E. I, II and III

The question asks which of the following MUST be true, not COULD be true. The largest possible value of x is 36, GCD of 144 and 108, and if x=36 then ONLY III is true.

If 144/x is an integer and 108/x is an integer, which of the [#permalink]

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03 Feb 2013, 12:24

If \(\frac{144}{x}\) is an integer, and \(\frac{108}{x}\) is an integer, which of the following must be true?

I. \(\frac{9}{x}\) is an integer II. \(\frac{12}{x}\) is an integer III. \(\frac{36}{x}\) is an integer

(A) I only (B) III only (C) I and II only (D) II and III only (E) I, II, and III

Source: Gmat Hacks 1800 set.

This is a repost, but the previous postings are still confusing. So the way I read this is "If \(\frac{144}{2}\) is an integer and \(\frac{108}{2}\) is an integer .." but that reasoning seems to be wrong, can someone explain why?

Edit - I get it now. It's the "MUST BE TRUE" part that I forgot to factor into. Anyway, if you get that part, this is pretty easy question. _________________

Re: If 144/x is an integer and 108/x is an integer, which of the [#permalink]

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26 May 2014, 04:32

can admin please help on this one......... the way i see is x can be 1 or 2 or 3

how do we decide whether 9/x , 12/x or 36/x is an integer if i chose x as 1 still {144}/{x} is an integer, and {108}/{x} is also an integer...same happens when i chose 2 but x as 1 and x as 2 given me differnt answer choices

Re: If 144/x is an integer and 108/x is an integer, which of the [#permalink]

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26 May 2014, 06:32

Expert's post

tyagigar wrote:

can admin please help on this one......... the way i see is x can be 1 or 2 or 3

how do we decide whether 9/x , 12/x or 36/x is an integer if i chose x as 1 still {144}/{x} is an integer, and {108}/{x} is also an integer...same happens when i chose 2 but x as 1 and x as 2 given me differnt answer choices

x could be 1, 2, 3, 4, 6, 9, 12, 18 or 36 (these are common factors of 144 and 108). The question asks which of the options MUST be an integer. Now, only 36/x is an integer for all possible values of x.

Re: If 144/x is an integer and 108/x is an integer, which of the [#permalink]

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13 Aug 2015, 05:27

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________

Re: If 144/x is an integer and 108/x is an integer, which of the [#permalink]

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04 Nov 2015, 15:09

I attacked this question in a different way: prime factorization of 144 = 2*2*2*2*3*3 = so we have four 4's and two of 3's prime factorization of 108 = 2*2*3*3*3 = we have two of 2's and three of 3's.

I 9/x is an integer. well, if x is 3*3 = then yes, 9/x is an integer. but if x is 2*2*3*3 = then 9/x is not divisible. since our question asks for must be true -> we know for sure that I is not true. Eliminate (A) I only, (C) I and II only, and (E) I, II, and III

II 12/x is an integer well, if x is 2*2*3 = or 2*2 or 2*3 = then yes, 12/x is an integer, but x can be 3*3*2. since it is a must be true, we can eliminate E, and thus B is the answer.

Re: If 144/x is an integer and 108/x is an integer, which of the [#permalink]

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16 Mar 2016, 02:01

We here just need to find the possible cases for values of x here largest GCD of 108 and 144 =32 so x=36 discard statement 1 and 2 Hence B _________________

Re: If 144/x is an integer and 108/x is an integer, which of the [#permalink]

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18 Mar 2016, 15:44

Hi guys, I still can't understand in which case I should use LCM and when GCF... Can you please rephrase the question the way that to solve it I would need to use LCM technique?

Thanks!

gmatclubot

Re: If 144/x is an integer and 108/x is an integer, which of the
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18 Mar 2016, 15:44

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