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In a senior class 72 % of male students and 80 % of female

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Intern
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In a senior class 72 % of male students and 80 % of female [#permalink] New post 05 Oct 2006, 18:01
In a senior class 72 % of male students and 80 % of female students have applied for college. What fraction of students in the senior class are male?

1) There are 840 Students

2) 75% of studets in senior class have applied to college.
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Manager
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 [#permalink] New post 05 Oct 2006, 18:22
B.

Stmt2 is sufficient

75%M+90%F=75%T, M-male, F-female, T- total

F=T-M
75%+90%(T-M)=T
from that we can find ratio M/T which is the fraction of the students who are males.
Director
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 [#permalink] New post 05 Oct 2006, 18:53
1 & 2 Unsufficient
For C:
72/100 * M + 80/100 *F = 840 * 75/100
72M + 80F = 840 *75

.72M + .8F = .75(M + F)

Solve the above two.
OA is C.
Manager
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 [#permalink] New post 05 Oct 2006, 19:13
I can get the answer with just (2)

72/100 M + 80/100 F = 75/100 (M+F)
72M+80F = 75 (M+F)
5F=3M
M:F = 5:3
M/Total = 5/8

So, should be (B).
Senior Manager
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 [#permalink] New post 06 Oct 2006, 07:58
Yup - one more for B.
  [#permalink] 06 Oct 2006, 07:58
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In a senior class 72 % of male students and 80 % of female

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