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MGMAT Number Properties DS Question

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MGMAT Number Properties DS Question [#permalink] New post 02 Dec 2009, 11:57
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A
B
C
D
E

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I'm not sure about this one, and couldn't find the question posted anywhere in the forum. Can anyone explain?

If C and D are integers, is C - 3D even?
(1) C and D are odd
(2) C - 2D is odd

[Reveal] Spoiler:
My initial thought was it had to be C, since if C = 3D then C-3d would be 0...OA is A though...I guess they're assuming that that 0 is not even? I thought the definition of even was remainder of 0 when dividied by 2, which would make 0 even?
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Re: MGMAT Number Properties DS Question [#permalink] New post 02 Dec 2009, 14:18
Where are you getting C = 3D? That's nowhere in the question as far as I see.

Here's how I see it:

Is C-3D even?

(1) tells you that C and D are both odd
Odd - (3)(Odd) = ??
Odd - (Odd)(Odd) = ??
Odd - Odd = EVEN
(1) is sufficient

(2) tells you C - 2D is odd
C - Even = Odd
C is Odd
so, Odd - 3D = ??
3D could be even or odd -- you need to know if D is even or odd and (2) does not tell you this.
(2) is insufficient
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Re: MGMAT Number Properties DS Question [#permalink] New post 02 Dec 2009, 18:05
Wow. How do you know if you've done too many problems in a day.... Thx for the response

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Re: MGMAT Number Properties DS Question [#permalink] New post 02 Dec 2009, 18:48
and BTW, 0 is an even number.
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Re: MGMAT Number Properties DS Question   [#permalink] 02 Dec 2009, 18:48
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