80% choose course M and C.....

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neilcao: Junior | Next Rank: 30 Posts; Posts: 24; Joined: Mon Nov 29, 2010 3:46 pm

by neilcao » Tue Feb 22, 2011 7:41 am

80% choose course M and course C....., how many people choose neither M nor C?

1. 50% choose M
2. 30% choose C but not M

How do we answer this question by drawing a draft? or is there any quicker way to do it?

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Source: Beat The GMAT — Data Sufficiency | Tue Feb 22, 2011 7:41 am

Night reader: Legendary Member; Posts: 1337; Joined: Sat Dec 27, 2008 6:29 pmFollowed by: 10 members; Thanked: 127 times

by Night reader » Tue Feb 22, 2011 8:06 am

what's the source of this question - its content seems to contradict the st(1). 50% people who choose course M can not contribute to 80% pool of people who chose both M and C (M&C).

neilcao wrote:80% choose course M and course C....., how many people choose neither M nor C?

1. 50% choose M
2. 30% choose C but not M

How do we answer this question by drawing a draft? or is there any quicker way to do it?

My knowledge frontiers came to evolve the GMATPill's methods - the credited study means to boost the Verbal competence. I really like their videos, especially for RC, CR and SC. You do check their study methods at https://www.gmatpill.com

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rros0770: Senior | Next Rank: 100 Posts; Posts: 46; Joined: Fri Mar 14, 2008 1:39 pm; Thanked: 3 times

by rros0770 » Wed Feb 23, 2011 1:54 pm

Hey Neilcao-

Agree with the points Night Reader made.

Is this copied word for word also? We're given percentages in the first half of the stem and in both statements, but the 2nd half of the stem asks "...how many people choose...". It wants a number, which we can't provide from this info.

If the current form in which this question has been presented is in fact correct, I'd have to say answer is E...

Gut feeling says there's a typo though

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