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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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Q: How many sq ft will 7 yards of gravel cover?
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