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# What is the mean of four consecutive even integers a ,b ,c ,d ?

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Intern
Joined: 19 Jan 2018
Posts: 4
What is the mean of four consecutive even integers a ,b ,c ,d ?  [#permalink]

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10 Mar 2018, 05:17
00:00

Difficulty:

(N/A)

Question Stats:

100% (00:03) correct 0% (00:00) wrong based on 3 sessions

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What is the mean of four consecutive even integers a ,b ,c ,d ?
i) a+d=b+c
ii) d-a=b+c

The official answer says B, since a=0 and d=6, the mean=3. But what if a=-6, b=-4, c=-2 and d=0? The mean would be -3 and since there are 2 possible situations in which S2 holds, the answer would be E. What am I doing wrong?

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Math Expert
Joined: 02 Sep 2009
Posts: 52362
What is the mean of four consecutive even integers a ,b ,c ,d ?  [#permalink]

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10 Mar 2018, 05:32
1
jamkub wrote:
What is the mean of four consecutive even integers a ,b ,c ,d ?
i) a+d=b+c
ii) d-a=b+c

The official answer says B, since a=0 and d=6, the mean=3. But what if a=-6, b=-4, c=-2 and d=0? The mean would be -3 and since there are 2 possible situations in which S2 holds, the answer would be E. What am I doing wrong?

Check here: what-is-the-mean-of-four-consecutive-even-integers-a-b-c-88766.html#p1358317 and here: m18-184157.html

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________
What is the mean of four consecutive even integers a ,b ,c ,d ? &nbs [#permalink] 10 Mar 2018, 05:32
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