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# Guests at a recent party ate a total of fifteen hamburgers.

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Intern
Joined: 08 Mar 2009
Posts: 20
Guests at a recent party ate a total of fifteen hamburgers.  [#permalink]

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02 Nov 2009, 04:00
2
6
00:00

Difficulty:

95% (hard)

Question Stats:

52% (00:48) correct 48% (01:31) wrong based on 135 sessions

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Guests at a recent party ate a total of fifteen hamburgers. Each guest who was neither a student nor a vegetarian ate exactly one hamburger. No hamburger was eaten by any guest who was a student, a vegetarian, or both. If half of the guests were vegetarians, how many guests attended the party?

(1) The vegetarians attended the party at a rate of 2 students to every 3 non-students, half the rate for non-vegetarians.
(2) 30% of the guests were vegetarian non-students

OPEN DISCUSSION OF THIS QUESTION IS HERE: http://gmatclub.com/forum/guests-at-a-r ... 04547.html

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Senior Manager
Joined: 18 Aug 2009
Posts: 273

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02 Nov 2009, 06:23
1
This Q should use spaghetti not ^\$% hamburgers... it is so twisted, represents the examiners mind

I'd go with A.
Here's how...

50% veg, 50% non veg
VEG{Students:Non-students}=2:3=2xNON-VEG{Students:Non-students}=4:3
(3/7 Non-Veg, are non-students who ate burgers)=15
=>Non-Veg = 35; total attendees = 70
Sufficient.

B.
Either not sufficient (disconnected sets) or I'm too tired to look at it anymore
Senior Manager
Joined: 31 Aug 2009
Posts: 374
Location: Sydney, Australia

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11 Nov 2009, 03:51
Wondering if anyone else has any alternative solutions to this?
Math Expert
Joined: 02 Sep 2009
Posts: 53716

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11 Nov 2009, 06:53
4
1
yangsta8 wrote:
Wondering if anyone else has any alternative solutions to this?

Guests at a recent party ate a total of fifteen hamburgers. Each guest who was neither a student nor a vegetarian ate exactly one hamburger. No hamburger was eaten by any guest who was a student, a vegetarian, or both. If half of the guests were vegetarians, how many guests attended the party?
(1) The vegetarians attended the party at a rate of 2 students to every 3 non-students, half the rate for non-vegetarians.
(2) 30% of the guests were vegetarian non-students

The stem:
Two groups: Students and not students (let's call them Professors), S and P; either Veg or Non.Veg, V and N.
V&P+N&P=P and V&S+N&S=S

We are told that that 15 hamburger was eaten 1 by each guest who was neither a student nor a vegetarian and only by them. So we know the number of P which are N=N&P=15.

Basically this info was given only to determine this number and to make the wording confusing. Tricky GMAT!

Half of the students V=N. --> Total=V+N=2V=2N. So if we knew the V or N we can calculate Total number of guests.

What do we know from the stem:
N&P=15
Total=V+N=2V=2N
V&P+N&P=V&P+15=P and V&S+N&S=S

Statements:
(1) V&S/V&P=2/3 and N&S/N&P=N&S/15=2*2/3 --> N&S=20 which means that non vegetarian students were 20, but we know that non vegetarian professors were 15, total non vegetarians N=20+15=35. Total =2N=2*35=70. Sufficient.

NOTE: If the rate of X (some fraction) is half the rate of Y (another fraction), then the rate of Y= twice rate of X.

(2) V&P=Total*30%. We can not calculate numerical value of V&P hence insufficient.

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Joined: 05 Mar 2008
Posts: 1398

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11 Nov 2009, 09:14
gmattokyo wrote:
This Q should use spaghetti not ^\$% hamburgers... it is so twisted, represents the examiners mind

I'd go with A.
Here's how...

50% veg, 50% non veg
VEG{Students:Non-students}=2:3=2xNON-VEG{Students:Non-students}=4:3
(3/7 Non-Veg, are non-students who ate burgers)=15
=>Non-Veg = 35; total attendees = 70
Sufficient.

B.
Either not sufficient (disconnected sets) or I'm too tired to look at it anymore

kudos..exactly right..spaghetti..
Intern
Joined: 09 Nov 2009
Posts: 16

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11 Nov 2009, 19:01
that's a 600 level question?
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GMAT 1: 410 Q35 V11
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Re: Guests at a recent party ate a total of fifteen hamburgers.  [#permalink]

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25 Apr 2013, 22:23
Can any one help me solving this using 2*2 matrix

Archit
Math Expert
Joined: 02 Sep 2009
Posts: 53716
Re: Guests at a recent party ate a total of fifteen hamburgers.  [#permalink]

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26 Apr 2013, 00:59
Archit143 wrote:
Can any one help me solving this using 2*2 matrix

Archit

Check here: guests-at-a-recent-party-ate-a-total-of-fifteen-hamburgers-104547.html
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Re: Guests at a recent party ate a total of fifteen hamburgers.  [#permalink]

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10 Jan 2019, 23:30
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Guests at a recent party ate a total of fifteen hamburgers.   [#permalink] 10 Jan 2019, 23:30
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