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DS: Newspaper

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DS: Newspaper [#permalink] New post 25 Nov 2005, 21:24
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Please explain your answers
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Re: DS: Newspaper [#permalink] New post 25 Nov 2005, 22:00
A.

x/y=7
x = 7y
nither x nor y = 27%
x + y = 73%
7y+y = 73
y = 73/8
x = 7(73)/8

y = (73/8)/(100)
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Re: DS: Newspaper [#permalink] New post 25 Nov 2005, 22:58
HIMALAYA wrote:
A.

x/y=7
x = 7y
nither x nor y = 27%
x + y = 73%
7y+y = 73
y = 73/8
x = 7(73)/8

y = (73/8)/(100)


did the same thing. it should be A.
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 [#permalink] New post 25 Nov 2005, 23:53
is it C then....

if it is C i will explain it.
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 [#permalink] New post 26 Nov 2005, 06:32
TeHCM wrote:
OA is not A.

probably the answer is based on "exactly what % of perople purchase only newspaper Y", but this is wrong because the question is "what % of perople purchase newspaper Y". therefore, we do not need the information i B that "how many buy x and y". C cannot be the answer..
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 [#permalink] New post 26 Nov 2005, 07:15
Must be (E)

No information about total population.
Without the instruction that X and Y are the only newspapers in that town, we don't know anything.
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 [#permalink] New post 26 Nov 2005, 09:01
C)...say 100 ppl. 27 do not buy either newspaper and 73 do buy either or both newspapers. 73/8 is the number of ppl who buy Y. 0,7*73/8 buy y and x. 73/8 - 0,7*73/8 buy only Y.
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 [#permalink] New post 26 Nov 2005, 09:03
HIMALAYA wrote:
TeHCM wrote:
OA is not A.

probably the answer is based on "exactly what % of perople purchase only newspaper Y", but this is wrong because the question is "what % of perople purchase newspaper Y". therefore, we do not need the information i B that "how many buy x and y". C cannot be the answer..


but without B) we cannot know how many ppl buy only y or only x.
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 [#permalink] New post 26 Nov 2005, 09:05
rule is group 1 + group 2 - neither + both = total

statement gives group 1 and group 2

1) gives neither

2) gives both

now we know group 1 / total
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 [#permalink] New post 26 Nov 2005, 22:15
christoph wrote:
HIMALAYA wrote:
TeHCM wrote:
OA is not A.
probably the answer is based on "exactly what % of perople purchase only newspaper Y", but this is wrong because the question is "what % of perople purchase newspaper Y". therefore, we do not need the information i B that "how many buy x and y". C cannot be the answer..

but without B) we cannot know how many ppl buy only y or only x.


but we donot need only Y, because the question is how many buy Y? therefore if we need Y buyers whether they also buy x or z.

x/y =7
x=7y

total who do not buy nither x nor y = 27
total who buy either x or y = 73
x+y = 73%
7y+y = 73%
y = (73/8)%

do we need only Y buyers?
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 [#permalink] New post 26 Nov 2005, 22:46
Your problem is that total people who buy A or B is not equal to x+y. If there are people who buy both then the 73% would be x+y-(people who buy both) because you would have double counted the people who buy both.
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 [#permalink] New post 27 Nov 2005, 08:27
HIMALAYA wrote:
christoph wrote:
HIMALAYA wrote:
TeHCM wrote:
OA is not A.
probably the answer is based on "exactly what % of perople purchase only newspaper Y", but this is wrong because the question is "what % of perople purchase newspaper Y". therefore, we do not need the information i B that "how many buy x and y". C cannot be the answer..

but without B) we cannot know how many ppl buy only y or only x.


but we donot need only Y, because the question is how many buy Y? therefore if we need Y buyers whether they also buy x or z.

x/y =7
x=7y

total who do not buy nither x nor y = 27
total who buy either x or y = 73
x+y = 73%
7y+y = 73%
y = (73/8)%

do we need only Y buyers?

i donot know where i am lost? somewhere...
i should refresh and restart it again...
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 [#permalink] New post 27 Nov 2005, 10:47
i agree with christoph, should be C.
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 [#permalink] New post 04 Dec 2005, 08:40
I spent 1/2 hr. trying to make this easier.

HEre is what I have":
T=(7/8)z+(1/8)z-B+N where z represents all people that by X or Y or both.
B is both and N is neither.

Unless B and N are both known, can't find z. Unless z is known (in terms of T), can't answer the Q.

:(
  [#permalink] 04 Dec 2005, 08:40
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