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10-09-2017
Mathematics

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The percent decrease from 12 to 9 is equal to the percent decrease from 40 to what number

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texaschic101 texaschic101

10-09-2017

(12 - 9) / 12 = (40 - x) / 40
3/12 = (40 - x) / 40
40(1/4) = 40 - x
10 = 40 - x
10 - 40 = -x
-30 = -x
30 = x <=== percent decrease from 40 to 30

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