Perctent Male

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aatech: Master | Next Rank: 500 Posts; Posts: 192; Joined: Tue Apr 29, 2008 7:41 am; Thanked: 14 times

by aatech » Sat May 31, 2008 11:14 am

If the drama club and music club is combined, what percent of the combined membership is male

1) Of the 16 members of the drama club, 15 are male
2) Of the 20 members of the music club, 10 are male

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Source: Beat The GMAT — Data Sufficiency | Sat May 31, 2008 11:14 am

netigen: Legendary Member; Posts: 631; Joined: Mon Feb 18, 2008 11:57 pmFollowed by: 3 members; Thanked: 29 times

by netigen » Sat May 31, 2008 1:04 pm

This is a poorly written question but given the information I would go with E.

We do not know if some members of the drama club are also members of the music club and vice versa hence E.

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aatech: Master | Next Rank: 500 Posts; Posts: 192; Joined: Tue Apr 29, 2008 7:41 am; Thanked: 14 times

by aatech » Sat May 31, 2008 4:32 pm

Ahhhh... That's a good point.. but that leaves us a lot to assume...

OA is E... and the question is out of GMAT PREP...

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Stuart@KaplanGMAT: GMAT Instructor; Posts: 3225; Joined: Tue Jan 08, 2008 2:40 pmFollowed by: 614 members; Location: Toronto; Thanked: 1710 times; GMAT Score:800

by Stuart@KaplanGMAT » Sat May 31, 2008 8:55 pm

aatech wrote:Ahhhh... That's a good point.. but that leaves us a lot to assume...

The reason that E is correct is because we CANNOT make any assumptions.

We don't know if there's any overlap, so we have to look at cases in which overlap exists and in which it doesn't.

If there's no overlap, then together we'd have enough info. If there is overlap, then we don't have enough info to determine the exact percentage. Since there's a valid case in which we don't have enough info, the statements are insufficient.

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

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pepeprepa: Legendary Member; Posts: 661; Joined: Tue Jul 08, 2008 12:58 pm; Location: France; Thanked: 48 times

by pepeprepa » Sat Aug 23, 2008 2:52 pm

I understand what Stuart explained and find the question a little dubious. If some people have already come across this kind of trap, please give the question.

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