SOLUTION: 90 juniors took different SAT-II tests. 40% more students took the Chemistry test than took the History test, and 50% more students took the Math test than took the Chemistry test.

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Question 1059821: 90 juniors took different SAT-II tests. 40% more students took the Chemistry test than took the History test, and 50% more students took the Math test than took the Chemistry test. How many students took each test?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
History test=x
Chemistry test=1.4x
Math test=(1.5)(1.4)=2.1x
They add to 90
4.5x=90
x=20 history
28 chemistry
42 math
They add to 90.