20ft x 10ft x 7ft = 1400 cubic feet
1 yard of dirt = 27 cubic feet
Hence yards required = 1400/27 = 51.85
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None because it's a hole but 6 cubic yards of dirt will fill it up.
You also need to specify the average depth.(And by "yards" we assume you mean cubic yards).
You are mixing volume (square yard) and area (length x width). How deep do you want the dirt? One foot deep you need about 80 square yards of dirt.
A yard of dirt is 3ft x 3ft x 3ft, or 27 cubic ft. The hole you need to fill is 8ft x 4ft x 1ft, or 32 cubic ft. You'll need 32/27th yards of dirt, or about 1.19 yards of dirt. Call it a yard and a half if you want to account for settling.
You can't fill a space with yards, only with cubic yards (27 cu.ft.).28 x 12 x 1/3 = 112 cubic feet / 27 cubic feet = 4.148148...cubic yards will be required.