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abilash10
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If W is divisible by 7, is Z even or odd? Updated on: 12 Aug 2014, 04:46
Originally posted by abilash10 on 04 Aug 2014, 20:22.
Last edited by Bunuel on 12 Aug 2014, 04:46, edited 1 time in total.
Edited the OA.
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

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15% (low)

Question Stats:

84% (00:53) correct 16% (01:00) wrong based on 112 sessions

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If W is divisible by 7, is Z even or odd?

(1) Z = W + 1
(2) W = 7


can someone help me out with this ?
i found this question in one of the question banks from gmatclub.
I'm facing discrepancy between the answer I've deduced and the one provided.
ShowHide Answer
Official Answer
C
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LighthousePrep
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If W is divisible by 7, is Z even or odd? 04 Aug 2014, 20:29
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abilash10
If W is divisible by 7, is Z even or odd?

Z = W+1.
W = 7.


can someone help me out with this ?
i found this question in one of the question banks from gmatclub.
I'm facing discrepancy between the answer I've deduced and the one provided.
Show more


The correct answer should be that you need both statements together to solve. Answer choice C.

Maybe the official answer was posted incorrectly?
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abilash10
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If W is divisible by 7, is Z even or odd? 04 Aug 2014, 20:41
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yes i guessed C as well. here's the official explanation.

https://s3.amazonaws.com/pushbullet-upl ... WA0002.jpg
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If W is divisible by 7, is Z even or odd? 04 Aug 2014, 22:17
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First of all, it is clear that each statement alone is insufficient.
But E cannot be correct.

Just look at the answer choices.
(1): Z = W + 1
(2): W = 7

Hence Z = 7 + 1 = 8 so C is clearly correct! The OA should be revised. I won't answer the question before that so I don't destroy the statistics here.

It's definitively C.
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If W is divisible by 7, is Z even or odd? 06 Aug 2014, 10:59
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abilash10
If W is divisible by 7, is Z even or odd?

Z = W+1.
W = 7.


can someone help me out with this ?
i found this question in one of the question banks from gmatclub.
I'm facing discrepancy between the answer I've deduced and the one provided.
Show more

E is the answer.
Z= W+1, W = 7k ( k is an integer) --> Z = 7k+1 , then Z can be either even or odd ( z= 8 when k = 1, z= 15 when k = 2)-> INSUFFICIENT
W= 7, nothing about z can we can infer
(1) and (2) combine: w = 7. z = 8, z is even--> sufficient
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abilash10
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If W is divisible by 7, is Z even or odd? 06 Aug 2014, 11:03
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vad3tha
abilash10
If W is divisible by 7, is Z even or odd?

Z = W+1.
W = 7.


can someone help me out with this ?
i found this question in one of the question banks from gmatclub.
I'm facing discrepancy between the answer I've deduced and the one provided.

E is the answer.
Z= W+1, W = 7k ( k is an integer) --> Z = 7k+1 , then Z can be either even or odd ( z= 8 when k = 1, z= 15 when k = 2)-> INSUFFICIENT
W= 7, nothing about z can we can infer
(1) and (2) combine: w = 7. z = 8, z is even--> sufficient
Show more

where does K come from though ? the second equation states a single value for W without any variables.
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If W is divisible by 7, is Z even or odd? 06 Aug 2014, 14:52
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Can any expert comment upon this.
I think the answer should be C, since you can use W = 7 in Z = W + 1 to get Z = 8 which is even. Suff.

Please confirm.
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If W is divisible by 7, is Z even or odd? 12 Aug 2014, 04:47
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abilash10
If W is divisible by 7, is Z even or odd?

(1) Z = W + 1
(2) W = 7


can someone help me out with this ?
i found this question in one of the question banks from gmatclub.
I'm facing discrepancy between the answer I've deduced and the one provided.
Show more

The correct answer is C. Edited the OA.
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