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In a sample of college students, 40 percent are third-year

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SVP
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Joined: 16 Oct 2003
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In a sample of college students, 40 percent are third-year [#permalink] New post 24 Dec 2005, 20:20
In a sample of college students, 40 percent are third-year students and 70 percent are not second-year students. What fraction of those students who are not third-year students are second-year students?
(A) 3/4
(B) 2/3
(C) 4/7
(D) 1/2
(E) 3/7
CEO
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Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
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 [#permalink] New post 24 Dec 2005, 21:23
D

First Year = F
Second Year = S
Third Year = T = 40

F + T = 70
So F = (F+T) - T = 70-40 = 30 and S = Total - (F+T) = 100 - 70 = 30

Not third year students = F + S = 30 + 30 = 60

Fraction = S/(F + S) = 30/60 = 1/2
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SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

Director
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 [#permalink] New post 25 Dec 2005, 05:45
ps_dahiya wrote:
D

First Year = F
Second Year = S
Third Year = T = 40

F + T = 70
So F = (F+T) - T = 70-40 = 30 and S = Total - (F+T) = 100 - 70 = 30

Not third year students = F + S = 30 + 30 = 60

Fraction = S/(F + S) = 30/60 = 1/2

Agree!Good approach
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Re: Votes [#permalink] New post 26 Dec 2005, 00:18
Bhai wrote:
In a sample of college students, 40 percent are third-year students and 70 percent are not second-year students. What fraction of those students who are not third-year students are second-year students?
(A) 3/4
(B) 2/3
(C) 4/7
(D) 1/2
(E) 3/7


Let the number of students be 100.

3rd year = 40
First year or 3rd year = 70 => First year = 30
and Second year = 30
Second /First + Second = 30/60 = 1/2
Re: Votes   [#permalink] 26 Dec 2005, 00:18
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