68 inches.
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20 feet
21.5/20 = 1.075 inches.
There are 12 inches in one foot so 246 inches equals 20.5 feet, or 20 feet and six inches.
1 yard = 3 feet 6 yards = 6 * 3 = 18 feet 18 feet + 2 feet = 20 feet 20 feet * 12 inches per foot = 240 inches
.20 inches