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In a certain senior class, 72 percent of the male students

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Manager
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In a certain senior class, 72 percent of the male students [#permalink] New post 26 Nov 2006, 06:09
00:00
A
B
C
D
E

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In a certain senior class, 72 percent of the male students and 80 percent of the female students have applied to college. What fraction of the students in the senior class are male?

1) There are 840 students in the senior class
2) 75 percent if the students in the senior class have applied to college
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Re: DS: GMATPREP2 [#permalink] New post 26 Nov 2006, 06:36
lfox2 wrote:
In a certain senior class, 72 percent of the male students and 80 percent of the female students have applied to college. What fraction of the students in the senior class are male?

1) There are 840 students in the senior class
2) 75 percent if the students in the senior class have applied to college


*********************************************************
I take back E and B is my answer

Stupid mistake made here :evil:

.72*x + .80* (100-x) = .75*840


*********************************************************


Should be E

From(1) we do do have any ratio of b/g

(2) 75% applied but we do not know the sub totals of how many boys/girls


Taken togther doesnt help

Last edited by trivikram on 26 Nov 2006, 09:26, edited 1 time in total.
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 [#permalink] New post 26 Nov 2006, 09:18
Answer is C

using 1:

let no. of male students = x
no. of female stds = 840-x

insuff

using 2:

.75 = applied

from the question

.72x + .8(840-x) = 630

-.08x = - 42
so x can be found

Hence C...
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 [#permalink] New post 26 Nov 2006, 12:32
Here is the best I could do:

x= total students

x- girls = men

so

x- .8(.75x)= men

x-.6x= men

.4x = men

40% are men

B

I just realized I did something wrong.

Not sure what exactly but I didn't find the right answer.
  [#permalink] 26 Nov 2006, 12:32
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