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If p is an integer, is q an integer?

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Status: Finally Done. Admitted in Kellogg for 2015 intake
Joined: 25 Jun 2011
Posts: 528

Kudos [?]: 4433 [1], given: 217

Location: United Kingdom
Concentration: International Business, Strategy
GMAT 1: 730 Q49 V45
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WE: Information Technology (Consulting)
If p is an integer, is q an integer? [#permalink]

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New post 11 Feb 2012, 17:41
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A
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C
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E

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  15% (low)

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76% (00:48) correct 24% (01:03) wrong based on 67 sessions

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If p is an integer, is q an integer?

(1) The average (arithmetic mean) of p, q, and r is p.
(2) r is an integer.

[Reveal] Spoiler:
Ok - this is how I am trying to solve this.
If the average of three numbers is one of the numbers, that means the numbers are equally spaced. p + q + r = 3p
q - p = p - r. In other words, the difference between p and q is equal to the difference between p and r. That doesn’t tell us if q is an integer, because you don’t know anything about r.
Statement (2) is also insufficient: simply knowing that r is an integer isn’t enough to tell you anything about q.
Taken together, the statements are sufficient as integer minus integer will always be an integer.

Is my explanation and thinking correct to arrive at answer C?
[Reveal] Spoiler: OA

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E.

MGMAT 1 --> 530
MGMAT 2--> 640
MGMAT 3 ---> 610
GMAT ==> 730

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Re: If p is an integer, is q an integer? [#permalink]

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New post 27 Jun 2015, 15:09
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Re: If p is an integer, is q an integer? [#permalink]

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New post 24 Dec 2017, 00:28
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).

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Re: If p is an integer, is q an integer?   [#permalink] 24 Dec 2017, 00:28
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