A foot is generally used as singular for one unit. for more than units feet is used in the plural form.
so ,that is why 15 feet is instead of 15 foot.
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30 X 15 = 450 square feet.
1 foot = 12 inches15 feet:= 15 feet * 12 inches/1 foot= 180 inches
The answer is 270 square feet.
165 square feet
180 square feet Assuming you mean a 12 foot by 15 foot floor, the answer is 12*15 = 180 square feet.