280 ft^2 ------- 4/5 gallon paint Area -------------- 3 gallon paint
Solve this problem using a rule of three
280 ft^2 ------------- 4/5 gallons
x ------------- 3 gallons
x = (3 x 280) / 4/5
Simplification
x = 840/ 4/5
x = 1050 ft^2
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