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

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In a certain city, the ratio of the number of people who [#permalink] New post 09 Sep 2008, 09:53
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 percent of the population purchase newspaper Y?

1. 27% of the population purchase neither newspaper X nor newspaper Y.
2. 70% of the people who purchase newspaper Y also purchase newspaper X.

a) 1 is sufficient
b) 2 is sufficient
c) 1 & 2 taken together are sufficient
d) Either 1 or 2 is sufficient
e) Niether 1 nor 2 is sufficient
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Re: Math Question [#permalink] New post 09 Sep 2008, 10:02
A

from stat A
73% of total purchase paper
so those buying y = 1/8(73%) = 9.125% of population.

stat B is not suff
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Re: Math Question [#permalink] New post 09 Sep 2008, 10:06
Agree with A.

On the first look, the question seems confusing with the concept of Set Theory and Venn diagram.
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Re: Math Question [#permalink] New post 09 Sep 2008, 12:07
HVD1975 wrote:
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 percent of the population purchase newspaper Y?

1. 27% of the population purchase neither newspaper X nor newspaper Y.
2. 70% of the people who purchase newspaper Y also purchase newspaper X.

a) 1 is sufficient
b) 2 is sufficient
c) 1 & 2 taken together are sufficient
d) Either 1 or 2 is sufficient
e) Niether 1 nor 2 is sufficient


I will go with C.

people who buy Y may or may not buy X ..
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Re: Math Question [#permalink] New post 09 Sep 2008, 12:23
people who buy Y is required here ; wudnt make any diff if the ones who buy Y buy X or Not

so A shud be the answer.
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Re: Math Question [#permalink] New post 09 Sep 2008, 12:25
I agree with C

From A... how many people buy both?

What is OA?
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Re: Math Question [#permalink] New post 09 Sep 2008, 12:40
stallone wrote:
people who buy Y is required here ; wudnt make any diff if the ones who buy Y buy X or Not

so A shud be the answer.



73% population= buy only X +only Y + both X and Y.
case 1: both X AND Y=0
then (1/8)*73 =9.133%

case 2: population who buy Y also buy X.
then (1/7)*73 =10.4%
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Re: Math Question   [#permalink] 09 Sep 2008, 12:40
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