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Beth received 3/10 of the votes cast in a certain

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Beth received 3/10 of the votes cast in a certain [#permalink] New post 25 Mar 2008, 18:38
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B
C
D
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Beth received 3/10 of the votes cast in a certain election. What fraction of the other votes cast would she have needed in order to have received 1/2 of the votes cast?
(A) 1/2
(B) 2/7
(C) 3/10
(D) 7/20
(E) 1/20
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Re: PS: Election [#permalink] New post 25 Mar 2008, 18:58
el1981 wrote:
Beth received 3/10 of the votes cast in a certain election. What fraction of the other votes cast would she have needed in order to have received 1/2 of the votes cast?
(A) 1/2
(B) 2/7
(C) 3/10
(D) 7/20
(E) 1/20


Are you sure C = 3/10, I think it is 2/10. So that C.
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Re: PS: Election [#permalink] New post 25 Mar 2008, 19:57
i get 2/7

votes she didnt recieve 7/10

votes she needs to get 1/2

3/10 + x=1/2

x=1/5

2/10/7/10=2/7
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Re: PS: Election [#permalink] New post 25 Mar 2008, 21:47
B

Out of 10 parts Beth received 3. She needs 2 more out of the remaining 7 parts to make it 5 (1/2 of 10). So it's 2/7.
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Re: PS: Election [#permalink] New post 26 Mar 2008, 01:33
I will go with B.

Why?

Same reason.

Assume that total no of votes is 10. She already has 3. She needs 2 more. Out of 7 remaining, she needs 2. Fraction is thus 2/7.
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Re: PS: Election   [#permalink] 26 Mar 2008, 01:33
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Beth received 3/10 of the votes cast in a certain

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