Percentile problem

[anoo.anand]

Angela’s grade was in the 90th percentile out of 80 grades in her class. In another class there were 19 grades higher than Angela’s. If nobody had Angela’s grade, then Angela was what percentile of the two classes combined?
a. 72
b. 80
c. 81
d. 85
e. 92


Tried searching ...has not yet been solved.. :)

I solved it doiing:

number of students less then angela = 71 ..in class 1

no of students less then angela = 80-19 = 61 -60 = 60 below her in class 2

thus : 71 + 60 = 131

( x/100)*160 = 131

=> x = (131 * 100 ) / 160 = 81 .87 .. = 81

but the answer is not 81 . :)

[acethegmat]

Angela’s grade was in the 90th percentile out of 80 grades in her class. In another class of 100 students there were 19 grades higher than Angela’s. If nobody had Angela’s grade, then Angela was what percentile of the two classes combined?

Your question stem missed out some key words. You should be able to solve it now:

90th percentile means 8 of 80 students
19 of 100 students - given

hence 19+8 = 27 students

27/180 - 15%
1 - 15% = 85%

Is 85 % the answer..?

[RonPurewal]

post4998.html#p4998

so is it angela, or amy?

[nitin_prakash_khanna]

It looks like Amy got those grades in 2007 and Angela got the same in 2009 :>

[Ben Ku]

Haha. Nice.

[gal.afgon]

I'm always surprise to notice that Gmat can be so hilarious . Usually when Ron is making fun on small and tiny things.

It's funny to read your posts.

Thanks.

[jnelson0612]

:-)