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55 people live in an apartment complex with three fitness

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55 people live in an apartment complex with three fitness [#permalink] New post 14 Apr 2013, 15:17
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Question Stats:

49% (02:16) correct 51% (01:15) wrong based on 83 sessions
55 people live in an apartment complex with three fitness clubs (A, B, and C). Of the 55 residents, 40 residents are members of exactly one of the three fitness clubs in the complex. Are any of the 55 residents members of both fitness clubs A and C but not members of fitness club B?

(1) 2 of the 55 residents are members of all three of the fitness clubs in the apartment complex.
(2) 8 of the 55 residents are members of fitness club B and exactly one other fitness club in the apartment complex.
[Reveal] Spoiler: OA

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Last edited by Tagger on 15 Apr 2013, 05:36, edited 2 times in total.
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Re: 55 people live in an apartment complex with three fitness cl [#permalink] New post 14 Apr 2013, 17:55
Answer is C

I would use the 3 overlapping sets formula to evaluate whether the stat 1 and 2 are sufficient.

Total people = people enrolled in A + people enrolled in B + people enrolled in C - (people enrolled in A & B only + people enrolled in B & C only + people enrolled in A &C only ) - 2 (people enrolled in A, B, and C).

Equation based on question stem :

55 = 40 - (people enrolled in A & B only + people enrolled in B & C only + people enrolled in A &C only ) - 2 (people enrolled in A, B, and C).

Stmt 1 gives only 2 (people enrolled in A, B, and C) - Not Sufficient

Stmt 2 gives only (people enrolled in A & B only + people enrolled in B & C only + people enrolled in A &C only ) - Not Sufficient

Considering Stmt 1 and Stmt 2 people enrolled in A &C only can be calculated.

//kudos please, if above explanation is good
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Re: 55 people live in an apartment complex with three fitness cl [#permalink] New post 14 Apr 2013, 21:05
We know that 55-40 people are numbers of 2 or more clubs.
Lets call a the members of only AC, b the members of only AB, c the members of only CB and d the members of all three. And consider n that are the members of none of those clubs!
n+a+b+c+d=15
Now the question is: is a >0? there are members in AC only?

1) tells us that d=2. We cannot say anything about a
m+a+b+2=15
2)tells us that b+c=8.Again not sufficient
n+a+8+d=15

1+2)n+a+8+2=15 We cannot say anything about A.
E
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Last edited by Zarrolou on 15 Apr 2013, 04:47, edited 1 time in total.
Edited: thanks Transcendentalist
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Re: 55 people live in an apartment complex with three fitness cl [#permalink] New post 15 Apr 2013, 04:38
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The question does not specify if there are people not member of any clubs. So isn't E a possibility as well?

Assume there are 5 people not a part of any club
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Re: 55 people live in an apartment complex with three fitness cl [#permalink] New post 15 Apr 2013, 04:46
Transcendentalist wrote:
The question does not specify if there are people not member of any clubs. So isn't E a possibility as well?

Assume there are 5 people not a part of any club


Indeed my friend, you are right. The question written as it is has E as answer
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Re: 55 people live in an apartment complex with three fitness cl [#permalink] New post 02 Jun 2014, 05:29
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: 55 people live in an apartment complex with three fitness cl   [#permalink] 02 Jun 2014, 05:29
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