That depends on the depth of gravel. I am going to assume 3 inches of gravel. One 'yard' really means a cubic yard in this context, which is volume.
V = Area of base x depth
7 = (A/9)(3/36) ---- A = 7(12)(9) = 756 sq ft
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6.666666666666666666666666666666666666666666666666 yards.
30 ft
20 yards
You cannot convert sq ft into yards, you must convert sq ft into sq yards. There are 9 sq feet in 1 sq yard so there are 283.33 sq yards in 2550 sq ft.
a yard = 3 ft therefore 96 ft = 96/3 = 32 yards