18 inches
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There are 12 inches in one foot. Therefore, 15 inches is equal to 15/12 = 1 remainder 3 or 1 foot 3 inches.
15 inches = 1 foot and 3 inches
1 foot = 12 inches15 feet:= 15 feet * 12 inches/1 foot= 180 inches
There are 12 inches to a foot, and 15 x 12 = 180
An inch is a unit of length. A square foot is a unit of area. The two units are therefore incompatible.