SOLUTION: Ninety percent of the ninth grade students at Richbartville High School take algebra. If 180 ninth grade students take algebra, how many ninth grade students do NOT take algebra?

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Question 132343: Ninety percent of the ninth grade students at Richbartville High School take algebra. If 180 ninth grade students take algebra, how many ninth grade students do NOT take algebra?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let s = number of 9th grade students
.9s+=+180
s+=+180%2F.9
s+=+200
If 90% take algebra, 10% do not take algebra
.1%2A200+=+20
20 9th grade students do not take algebra