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Percentages

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gmatstudent
 Post subject: Percentages
 Post Posted: Fri Apr 18, 2008 5:45 pm 
At Daifu university, 40% of all students are both members of a student organization and want to reduce their tuition costs. 20% of those students who want to reduce tuition are not members of the student organization. What percentage of all Daifu students want to reduce tuition?


* 20%
* 30%
* 40%
* 50%
* 60%
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RonPurewal
 Post subject:
 Post Posted: Fri Apr 18, 2008 9:26 pm 
Offline
ManhattanGMAT Staff


Posts: 7146
please give the source of this problem. if you don't give the source within the next few days, then unfortunately, we'll have to delete the problem.

thanks
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gmatstudent
 Post subject: Percentages - Princeton Review
 Post Posted: Mon Apr 21, 2008 11:13 am 
The source is above
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RonPurewal
 Post subject:
 Post Posted: Wed Apr 23, 2008 4:31 am 
Offline
ManhattanGMAT Staff


Posts: 7146
use a double set matrix. the key is the realization that the 40% is an absolute percentage, but the 20% is a percentage OF a different quantity in the problem (read it carefully!). you can set the total to 100, because there's no indication of the total number of students.

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