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

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Manager
Joined: 05 Sep 2007
Posts: 146
Location: New York
Followers: 1

Kudos [?]: 10 [0], given: 0

Beth received 3/10 of the votes cast in a certain [#permalink]  25 Mar 2008, 18:38
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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
SVP
Joined: 04 May 2006
Posts: 1941
Schools: CBS, Kellogg
Followers: 17

Kudos [?]: 282 [0], given: 1

Re: PS: Election [#permalink]  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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Current Student
Joined: 28 Dec 2004
Posts: 3405
Location: New York City
Schools: Wharton'11 HBS'12
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Kudos [?]: 159 [0], given: 2

Re: PS: Election [#permalink]  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
Senior Manager
Joined: 15 Aug 2007
Posts: 255
Schools: Chicago Booth
Followers: 1

Kudos [?]: 53 [0], given: 0

Re: PS: Election [#permalink]  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.
Intern
Joined: 04 May 2004
Posts: 49
Location: India
Followers: 0

Kudos [?]: 16 [0], given: 0

Re: PS: Election [#permalink]  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.
_________________
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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