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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..

No information about total population.
Without the instruction that X and Y are the only newspapers in that town, we don't know anything. _________________

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.

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.

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)%

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.

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...