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

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Manager
Joined: 03 Jul 2005
Posts: 195
Location: City
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In a certain senior class, 72 percent of the male students [#permalink]  26 Nov 2006, 06:09
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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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
VP
Joined: 28 Mar 2006
Posts: 1386
Followers: 2

Kudos [?]: 19 [0], given: 0

Re: DS: GMATPREP2 [#permalink]  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

.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.
Manager
Joined: 15 Aug 2006
Posts: 54
Followers: 1

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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...
Manager
Joined: 01 Apr 2006
Posts: 98
Followers: 2

Kudos [?]: 6 [0], given: 0

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.
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