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siniylev
3 months ago
12

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

Mathematics
1 answer:
Leona [12.6K]3 months ago
8 0
(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 <=== percentage decrease from 40 to 30
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