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# DS: Newspaper

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VP
Joined: 06 Jun 2004
Posts: 1059
Location: CA
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DS: Newspaper [#permalink]  25 Nov 2005, 21:24
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Attachments

Newspaper.jpg [ 19.37 KiB | Viewed 646 times ]

SVP
Joined: 05 Apr 2005
Posts: 1733
Followers: 5

Kudos [?]: 38 [0], given: 0

Re: DS: Newspaper [#permalink]  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)
SVP
Joined: 28 May 2005
Posts: 1743
Location: Dhaka
Followers: 6

Kudos [?]: 72 [0], given: 0

Re: DS: Newspaper [#permalink]  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.
_________________

hey ya......

SVP
Joined: 28 May 2005
Posts: 1743
Location: Dhaka
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Kudos [?]: 72 [0], given: 0

is it C then....

if it is C i will explain it.
_________________

hey ya......

SVP
Joined: 05 Apr 2005
Posts: 1733
Followers: 5

Kudos [?]: 38 [0], given: 0

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..
Director
Joined: 14 Sep 2005
Posts: 994
Location: South Korea
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Must be (E)

Without the instruction that X and Y are the only newspapers in that town, we don't know anything.
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Auge um Auge, Zahn um Zahn !

VP
Joined: 30 Sep 2004
Posts: 1490
Location: Germany
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Kudos [?]: 91 [0], given: 0

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.
_________________

If your mind can conceive it and your heart can believe it, have faith that you can achieve it.

VP
Joined: 30 Sep 2004
Posts: 1490
Location: Germany
Followers: 4

Kudos [?]: 91 [0], given: 0

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.
_________________

If your mind can conceive it and your heart can believe it, have faith that you can achieve it.

VP
Joined: 30 Sep 2004
Posts: 1490
Location: Germany
Followers: 4

Kudos [?]: 91 [0], given: 0

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
_________________

If your mind can conceive it and your heart can believe it, have faith that you can achieve it.

SVP
Joined: 05 Apr 2005
Posts: 1733
Followers: 5

Kudos [?]: 38 [0], given: 0

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?
SVP
Joined: 03 Jan 2005
Posts: 2250
Followers: 13

Kudos [?]: 217 [0], given: 0

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.
_________________

Keep on asking, and it will be given you;
keep on seeking, and you will find;
keep on knocking, and it will be opened to you.

SVP
Joined: 05 Apr 2005
Posts: 1733
Followers: 5

Kudos [?]: 38 [0], given: 0

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...
Manager
Joined: 21 Mar 2005
Posts: 115
Location: Basel
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i agree with christoph, should be C.
Manager
Joined: 30 Aug 2005
Posts: 187
Followers: 1

Kudos [?]: 3 [0], given: 0

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.

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