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In a college , 1/2 of them are first year students and the

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Director
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In a college , 1/2 of them are first year students and the [#permalink] New post 23 Nov 2004, 14:53
In a college , 1/2 of them are first year students and the rest are second year students. Out of the first year students 4/5 have not decided on their majors . The fraction of the second year students who decided on the majors is three times the fraction of the first year students who decided on the majors. what is the fraction of the second year students who did not decide on the majors.
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 [#permalink] New post 24 Nov 2004, 03:06
To ease the reasoning lets consider a 100 pool of students :
50 are 1Y and 50 are 2Y

40 1Y have not decided their majors, so 10 did (1/5)

So 3/5 of 2Y students have decided their majors id est 30

So 20 2Y students are still hesitating.

Fraction : 20/50 = 2/5
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 [#permalink] New post 24 Nov 2004, 03:42
(1 - 4/5) of 1st year students decided on their majors -> 3/5 of 2nd year students decided on their majors
hence
(1 - 3/5) = 2/5 of 2nd year students did not decide on their majors.
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Re: student fractions [#permalink] New post 24 Nov 2004, 05:59
vprabhala wrote:
In a college , 1/2 of them are first year students and the rest are second year students. Out of the first year students 4/5 have not decided on their majors . The fraction of the second year students who decided on the majors is three times the fraction of the first year students who decided on the majors. what is the fraction of the second year students who did not decide on the majors.


I have question, is the question fraction of second years who did not decide wrt to entire student population or just the second year students?
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 [#permalink] New post 24 Nov 2004, 07:12
i think its respect to the second years
  [#permalink] 24 Nov 2004, 07:12
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In a college , 1/2 of them are first year students and the

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