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GMAT Prep - Percentages

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Source: — Data Sufficiency |
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by krishnasty » Fri Aug 12, 2011 3:23 am
IMO C

from the first equation, we get that 40% of class who got P are females.
from the 2nd equations, we get that 20% of class who got F or I are females.
The enitre class just got one grade and no one was missed out,
calcuating, the number of females come close to 42%..

Although i m not sure of my approach, i think C is the ans
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by gmatboost » Fri Aug 12, 2011 8:06 am
We have no idea what % actually received a P, F, or I, so the answer is E. There is no way to calculate the answer without knowing these percentages.

For example, compare the answer when 60% passed vs. when 20% passed.
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