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Is x/3 an integer?

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Is x/3 an integer? [#permalink] New post 19 May 2010, 00:49
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Question Stats:

34% (02:18) correct 66% (00:52) wrong based on 87 sessions
Is x/3 an integer?

(1) 7x/3 = Positive integer
(2) 14x/3 = Positive integer
[Reveal] Spoiler: OA
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Re: x/3 an integer? [#permalink] New post 19 May 2010, 01:52
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D.
- For 7 is indivisible by 3, then x must be divisible by 3 => x/3 an integer
- 14 = 7*2, neither is divisible by 3, then x must be divisible by 3 => x/3 an integer
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Re: x/3 an integer? [#permalink] New post 19 May 2010, 02:28
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dimitri92 wrote:
Is x/3 an integer?

(1) 7x/3 = Positive integer
(2) 14x/3 = Positive integer


Is \frac{x}{3}=integer?

Note that we are not told that x is an integer.

(1) \frac{7}{3}x = Positive integer --> x is of a type x=\frac{3k}{7}, where k is an integer >{0}. Hence x may be multiple of 3 (3, 6, ...) in this case \frac{x}{3}=integer OR x can be reduced fraction (3/7, 6/7, ...) in this case \frac{x}{3}\neq{integer}. Not sufficient.

(2) \frac{14}{3}x = Positive integer --> x is of a type x=\frac{3n}{14}, where n is an integer >{0}. Hence x may be multiple of 3 (3, 6, ...) in this case \frac{x}{3}=integer OR x can be reduced fraction (3/14, 6/14=3/7, ...) in this case \frac{x}{3}\neq{integer}. Not sufficient.

(1)+(2) No new info. If x=3, answer is YES but if x=\frac{3}{7}, answer is NO. Not sufficient.

Answer: E.
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Re: x/3 an integer? [#permalink] New post 19 May 2010, 02:30
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Bunuel wrote:
dimitri92 wrote:
Is x/3 an integer?

(1) 7x/3 = Positive integer
(2) 14x/3 = Positive integer


Is \frac{x}{3}=integer?

Note that we are not told that x is an integer.

(1) \frac{7}{3}x = Positive integer --> x is of a type x=\frac{3k}{7}, where k is an integer >{0}. Hence x may be multiple of 3 (3, 6, ...) in this case \frac{x}{3}=integer OR x can be reduced fraction (3/7, 6/7, ...) in this case \frac{x}{3}\neq{integer}. Not sufficient.

(2) \frac{14}{3}x = Positive integer --> x is of a type x=\frac{3n}{14}, where n is an integer >{0}. Hence x may be multiple of 3 (3, 6, ...) in this case \frac{x}{3}=integer OR x can be reduced fraction (3/14, 6/14=3/7, ...) in this case \frac{x}{3}\neq{integer}. Not sufficient.

(1)+(2) No new info. If x=3, answer is YES but if x=\frac{3}{7}, answer is NO. Not sufficient.

Answer: E.


wow that was brilliant
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Re: x/3 an integer? [#permalink] New post 20 May 2010, 16:54
Good one I didn't see that coming...I gotta keep asking the important parameter questions. What info is given about X?
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Re: x/3 an integer? [#permalink] New post 13 Jul 2010, 00:59
Oh yeah..integer trap thing..it took me weeks to get over that. Still got me sometimes :cry: ! Here's another good integer trap with excellent explanation from HRH Bunuel
http://gmatclub.com/forum/odd-even-95982.html
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Re: x/3 an integer? [#permalink] New post 13 Jul 2010, 07:20
What a trap; hatsoff
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Re: Is x/3 an integer? [#permalink] New post 05 Jan 2014, 12:45
dimitri92 wrote:
Is x/3 an integer?

(1) 7x/3 = Positive integer
(2) 14x/3 = Positive integer


Obviously each statement alone is insufficient

Now, both together

x can be 3/7 and will satisfy all conditions, is it an integer no

x can also be any multiple of 3 giving answer as yes

So I'm betting my @$$ on E here

Cheers!
J :)
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Re: Is x/3 an integer? [#permalink] New post 14 Feb 2014, 01:10
dimitri92 wrote:
Is x/3 an integer?

(1) 7x/3 = Positive integer
(2) 14x/3 = Positive integer



Got wrong.. It tuk around 30 second to choose option D..question shud have mentioned that x is integer :D

A lesson to learn from this question is.. chek..whether question has mentioned that X is integer or not :(
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Re: Is x/3 an integer?   [#permalink] 14 Feb 2014, 01:10
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