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

Question

Mathematics

Donald Glover

23 January, 04:14

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

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Cuddles · Answer 1

(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