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# Combining Two Groups, Find Percentage

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Intern
Joined: 08 Apr 2010
Posts: 23
Combining Two Groups, Find Percentage [#permalink]

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18 May 2010, 13:19
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50% (02:18) correct 50% (00:00) wrong based on 13 sessions

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I can't figure out why I missed this problem...

There are 15/16 males in drama, 10/20 in music... wouldn't there just be 25/36 males in the new combined program?
Would the GMAT be so tricky as the imply that the new group consists of only SOME of the members? That's in no way stated and would be completely unexpected.

Thoughts?
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Senior Manager
Joined: 25 Jun 2009
Posts: 302
Re: Combining Two Groups, Find Percentage [#permalink]

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18 May 2010, 14:21
1
KUDOS
shammokando wrote:
I can't figure out why I missed this problem...

There are 15/16 males in drama, 10/20 in music... wouldn't there just be 25/36 males in the new combined program?
Would the GMAT be so tricky as the imply that the new group consists of only SOME of the members? That's in no way stated and would be completely unexpected.

Thoughts?

Its E because we dont know whether the two clubs has any common members, no where in the question it says that these are distinct members.
Senior Manager
Affiliations: SPG
Joined: 15 Nov 2006
Posts: 327
Re: Combining Two Groups, Find Percentage [#permalink]

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18 May 2010, 20:11
There are questions types on GMAT that deal with two group intersection ...Take a look at the Venn Diagram questions in the OG .....So based on my understanding from these type of questions ....we still dont know the number of common members in both groups ...

say both groups had 15 members common ...then this reduces the total number from 36 to 21 ..but we still dont know the number of males in this case .....i think the missing piece of information is the number of common males in both groups ...

Intern
Joined: 23 May 2010
Posts: 5
Re: Combining Two Groups, Find Percentage [#permalink]

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24 May 2010, 10:16
Well baby, the question , in my opinion is not clear. Here they actually mean to ask the members that join drama and music at the same time( which mean taking 2 of them at the same time). Not just simply the total student in 2 classes( as the way you calcuclated) Becareful when u see the question is so easily solved, there must be tricks int there.
Manager
Joined: 24 Apr 2010
Posts: 62
Re: Combining Two Groups, Find Percentage [#permalink]

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09 Aug 2010, 03:21
I think it is nothing but like critical question answer that sometimes you dont agree with....
It is trap out of their assumption....like asking
is it half filled or half empty....?

Straight reasoning is that
unless it is clearly stated there is no reason to assume/imagine or bring extra variables...and feel there may be overlapping(i dont disagree there can be...but it should be stated...)
it is not critical reasoning question i guess...

so i think mathematically you are not wrong but in gmat you are...(but just an imaginaition if they say you are right forwarding the above mentioned reason ...in that case also there is nothing wrong)
Re: Combining Two Groups, Find Percentage   [#permalink] 09 Aug 2010, 03:21
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# Combining Two Groups, Find Percentage

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