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It is 3 yards because it equals 108 inches
20 yards/60 inches = 20*36/60 = 12 of them.
20 yards
20 yards = 60 feet
In order to answer this question you must first convert the measurements into inches(20 ft= 240 in), so the new problem is 240*240*3, which equals 172800. Then you must convert the inches into yards by dividing 172800 by 36, which equals 4800. So it takes 4800 yards of sand to fill a sandbox 20 feet by 20 feet by 3 inches.