The product is 180
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9 x 20 = 180
Subtract 9 from each side. ( subtraction; both sides ) X + 9 = 20 X + 9 - 9 = 20 - 9 X = 11 -----------------check in original equation 11 + 9 = 20 20 = 20 checks
9 out of 20 = 9/20 = 9 ÷ 20 = 0.45: 0.45 x 100 = 45%
For 9 ft x 20 ft = 180 ft²
% rate= (9/20) x 100% = 45%