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GMAT PREP 11 #3

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Senior | Next Rank: 100 Posts
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by wizardofwashington » Fri Sep 21, 2007 2:52 pm
Is the answer D (85%-ile?) If not, I think I really need to get a lesson on how to solve this problem.
A
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This is baffling..

by wizardofwashington » Sun Sep 23, 2007 6:47 pm
Well.. My approach was a bit more crude than yours. I wonder where did you end up getting that 72?

This is how I solved it.
(90+81)/2 = 85.5 ~ 85
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by nkumar » Mon Sep 24, 2007 2:26 pm
No you can't do mean of 90 and 81. Amy is 90 percentile so her rank is 90% of 80 i.e. 72. So there are 8 students ahead of her in her own class. Total no. of students ahead of her are 8 plus 18 = 26.
so she is 27th in combined class. rank 100- (27/180)*100
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by niks_01.27 » Mon Sep 24, 2007 4:05 pm
My vote too is for 85th.

I solved with the other approach, but nkumar I liked your's better. Thanks
regards
niks...
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thanks

by wizardofwashington » Mon Sep 24, 2007 8:54 pm
Well, I second Nik's opinion. Nkumar's approach is lot more logical than mine. Thanks for the insightful solution. Your approach makes perfect sense.
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