80 multiplied by 15 is 1,200.
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5.33333333333333 x 15 = 80
85 - (15/100 x 80) = 85 - (0.15 x 80) = 73
12 (80 x .15=12)
Decreasing 80 by 15% results in 68.__________________________________15% = 0.1580 x 0.15 = 1280 - 12 = 68or80 - (80 x 0.15) = 68
Assuming the third angle is x... 180 = 15 +85 + x 180 = 100 +x 80 = x The third angle is 80 degrees