SOLUTION: Ninety percent of the ninth grade students at Highland 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 1037278: Ninety percent of the ninth grade students at Highland High school take algebra. If 180 ninth grade students take algebra, how many ninth grade students do not take algebra ?
Answer by Cromlix(4381) About Me  (Show Source):
You can put this solution on YOUR website!
Hi there,
90% = 180
1% = 180/90
100% = 180/90 x 100
100% = 200.
Total in Ninth Grade = 200
Those taking Algebra = 180
Those not taking Algebra = 20
Hope this helps :-)