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# On a recent test, Kevin scored m percent higher than the

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Manager
Joined: 14 Dec 2011
Posts: 76
On a recent test, Kevin scored m percent higher than the [#permalink]

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30 Nov 2012, 22:43
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Question Stats:

69% (01:56) correct 31% (00:50) wrong based on 52 sessions

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On a recent test, Kevin scored m percent higher than the class average, while Katherine scored n percent higher than the class average. What was the class average?

(1) n – m = 7
(2) m = 12
[Reveal] Spoiler: OA

Last edited by Bunuel on 01 Dec 2012, 06:55, edited 1 time in total.
Renamed the topic.
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Joined: 02 Jul 2012
Posts: 1223
Location: India
Concentration: Strategy
GMAT 1: 740 Q49 V42
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Re: Question based on average [#permalink]

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30 Nov 2012, 23:05
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KUDOS
vinnik wrote:
On a recent test, Kevin scored m percent higher than the class average, while Katherine scored n percent higher than the class average. What was the class average?

(1) n – m = 7

(2) m = 12

Thanks & Regards
Vinni

1) We do not get any useful data from this. Obviously insufficient.

2) We do not get any useful data from this. Obviously insufficient.

1 & 2 together. m = 12% and n = 19%. We still do not have any idea about the class average. Insufficient.

I find it hard to explain why 1 & 2 are "obviously" insufficient. If you could tell me how one could think them to be sufficient, I'll try my best to provide an explanation.
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Manager
Joined: 14 Dec 2011
Posts: 76
Re: Question based on average [#permalink]

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01 Dec 2012, 10:08
MacFauz wrote:

1) We do not get any useful data from this. Obviously insufficient.

2) We do not get any useful data from this. Obviously insufficient.

1 & 2 together. m = 12% and n = 19%. We still do not have any idea about the class average. Insufficient.

I find it hard to explain why 1 & 2 are "obviously" insufficient. If you could tell me how one could think them to be sufficient, I'll try my best to provide an explanation.

Thanks MacFauz, i was thinking exactly the same way, but i wasn't confident.

Regards Vinni
Manager
Joined: 26 Feb 2013
Posts: 177
Re: Question based on average [#permalink]

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17 Oct 2013, 01:54
MacFauz wrote:
vinnik wrote:
On a recent test, Kevin scored m percent higher than the class average, while Katherine scored n percent higher than the class average. What was the class average?

(1) n – m = 7

(2) m = 12

Thanks & Regards
Vinni

1) We do not get any useful data from this. Obviously insufficient.

2) We do not get any useful data from this. Obviously insufficient.

1 & 2 together. m = 12% and n = 19%. We still do not have any idea about the class average. Insufficient.

I find it hard to explain why 1 & 2 are "obviously" insufficient. If you could tell me how one could think them to be sufficient, I'll try my best to provide an explanation.

We need a starting point (a score) in order to be able to deduce actual numbers from percentages.
It's the classic "given a percentage, find the number" type of question I think. Hence, obviously we can't deduce anything from 1+2.
Re: Question based on average   [#permalink] 17 Oct 2013, 01:54
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