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At a certain health club, 30% of the members use both pool

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At a certain health club, 30% of the members use both pool [#permalink] New post 29 Oct 2006, 09:40
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At a certain health club, 30% of the members use both pool and sauna, but 40% of the members who use the pool do not use the sauna. What percent of the members of the health club use the pool?

a. 33 1/3%
b. 40%
c. 50%
d. 62 1/2%
e. 75%
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 [#permalink] New post 29 Oct 2006, 09:48
c. 50%

let 100 be the total of the members
30 represents the 60% of ppl using the pool hence you can work out that 50 members (50%) use the pool
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 [#permalink] New post 29 Oct 2006, 09:59
Got it! Thanks :) I think i'm burnt out. Making so many mistakes on the simple problems.
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 [#permalink] New post 29 Oct 2006, 10:08
Code:
30 represents the 60% of ppl using the pool hence you can work out that 50 members (50%) use the pool


I am getting lost here....Can you explain it??

Thnks in Advance,
girikorat
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 [#permalink] New post 29 Oct 2006, 10:13
Given:
40% of the members who use the pool do not use the sauna ---> this statement also means that 60% of the members who use the pool, also use the sauna.

So we get 60%x=30

x=50
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 [#permalink] New post 29 Oct 2006, 10:17
I solved by using a venn diagram..

Haven't figure out how to 'draw this out' on the board.. so bear w/ me..

So we have three areas of the diagram: Pool, Both, and Sauna..

Pool = X
Both = 30
Sauna = 2x/5
(since 40% of the members who use the pool do not use the sauna)

solve the following equation...

x + 2x/5 + 30 = 100
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 [#permalink] New post 29 Oct 2006, 19:40
i thin it is from kap. 50%. wording is tricky here.
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 [#permalink] New post 30 Oct 2006, 04:08
Yes, this is from Kaplan. Wording is definitely tricky!!!
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  [#permalink] 30 Oct 2006, 04:08
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