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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06-04-2018
Mathematics

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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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Аноним Аноним · Answer 1 · 2018-04-06T00:47:46+02:00

90% of the students takes algebra
⇒ 100 - 90 = 10% do not take algebra

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Find 1%:
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90% = 180
1% = 180 ÷ 90
1% = 2

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Find 10%
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1% = 2
10% = 2 x 10
10% = 20

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Answer: 20 students do not take algebra.
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