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In a certain city, the ratio of the number of people who

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Senior Manager
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In a certain city, the ratio of the number of people who [#permalink] New post 30 Oct 2006, 05:07
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A
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C
D
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In a certain city, the ratio of the number of people who purchase newspaper X to the number of people who purchase newspaper Y is 7:1. What percet of the population purchases newspaper Y?

(1) Twenty-seven percent of the population purchases neither newspaper X nor newspaper Y

(2) 70% of the people who purchase newspaper Y also purchase newspaper X
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Senior Manager
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Answer A [#permalink] New post 30 Oct 2006, 09:43
(1) We need to know how many people dont purchase either newspaper and sttament 1 provdes the info Suff
(2) In suff this onlu tels us how many people purchase both new ppaper which is of no use to us

If the question was what % of people purchase only Y and not X then statement 2 would be useful
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 [#permalink] New post 30 Oct 2006, 12:02
Not sure about your answer their Damager, this looks like a Groups question in sheep's clothing.

Mind you, I only clued in on that once I hit statement 1.

Total = G1 + G2 - both + neither

From Q we have: 100 = Y + 7Y - both + neither

Looks to me that we need both S1 & S2 to come to an answer, so D for me

(and just to check)

100 = Y + 7Y - 0.7Y + 27
73 = 7.3Y
Y = 10 percent
X = 70 percent
both = 7 percent

Which makes me feel better, because all GMAT math questions, even DS, seem to need to work out cleanly.
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 [#permalink] New post 30 Oct 2006, 12:12
St 1 just gives us neither ..insuff
st2 just gives us both ...insuuf

Combining 1 and 2 we get Y

So answer is C

what is OA?
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 [#permalink] New post 31 Oct 2006, 05:56
With the current problem statement and the reasoning provided by Damager, I feel A is the correct option.
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 [#permalink] New post 31 Oct 2006, 06:34
This is another Kaplan question and I don't have the OA. Although based on the answers above, I am leaning towards C. Someone care to give another computation? That of stonape is a bit confusing.
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  [#permalink] 31 Oct 2006, 06:34
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