12/15 = 4/5 = 80 percent
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Assuming the area is a rectangle (and not an ellipse, for example), it is 15*12 = 180 square feet.
(15 feet 6 inches) * (12 feet 9 inches) = 197.625 square feet.
To find the answer multiply length by the width, so 12' x 15' = 180 square feet.
= 15 x 24 /(12 x 12) = 2.5 sq feet
There are 12 inches in one foot. Therefore, 120 inches si equal to 120/12 = 10 feet. 10 feet x 15 feet = 150 square feet (150 ft2)