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GMAT Prep Que - fraction of this year's graduating males?

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by rookiez » Sat Jun 27, 2009 6:45 am
Please help me understand this que.

OA is C
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Source: — Data Sufficiency |
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by ssmiles08 » Sat Jun 27, 2009 7:15 am
1) is not enough: .33(M) and .20(F) are given. two unknowns, cannot be solved. INSUFF

2) .25(M+F) are transferred, again two unknowns. INSUFF

together: SUFFICIENT.

set up a chart. since you are given two percentages, you can make total M = 100.

33 + 0.20X = 0.25(100 + x)

8 = .05X

x = 160.

since x is total female and 100 is total male,

the fraction of males in the entire college is: 100/(100+160) = 5/13
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by aj5105 » Mon Jun 29, 2009 4:13 am
33/100 M + 20/100 F = 25/100 (M+F)

.33M + .20F = .25(M+F)

Simplify

8M = 5F

M/F = 5/8

M/T = 5/13

(C)
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