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OA: D I thought the ratio needs to be GREATER than 80/300 =

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OA: D I thought the ratio needs to be GREATER than 80/300 = [#permalink] New post 08 Feb 2007, 12:45
OA: D

I thought the ratio needs to be GREATER than 80/300 = 0.0375, so I picked E. What did I do wrong? :shock:

Thanks in advance.
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Director
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 [#permalink] New post 08 Feb 2007, 12:53
easy way to do this: TA/Students > 3/80
If x is number of students,
=> 5/x > 3/80
=>x <133> max number of students: 133.
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 [#permalink] New post 08 Feb 2007, 14:43
T = teacher
S = Student

T/S > 3/80

If T=5, S = ?

Teacher/Student = 3/80 = 5/S

S = 80 x 5/3 = 133 1/3

Must pick 133 to make the condition valid.

D is the answer.
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Re: Gmatprep - ratio [#permalink] New post 08 Feb 2007, 15:32
joyce wrote:
OA: D

I thought the ratio needs to be GREATER than 80/300 = 0.0375, so I picked E. What did I do wrong? :shock:

Thanks in advance.


We know TA/Student > 3/80
Now TA = 5

So, the maximum number of students possible is 5*80/3 = 133 (approx.)
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 [#permalink] New post 08 Feb 2007, 15:42
Agreed it should be 133. For the explainations above!
  [#permalink] 08 Feb 2007, 15:42
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OA: D I thought the ratio needs to be GREATER than 80/300 =

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