4 inches = 1/3 foot
27 cubic feet = 1 cubic yard
Volume = 80 x 1/3 = 80/3 cubic feet = 80/81cubic yard = about 0.987654321 (really!)
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To make one yard of concrete from 80# bags you will need about 40-45 bags. Each bag is about .67 or 2/3 cubic foot. you will need 27 cubic feet to make 1 cubic yard. Cheaper to have a redimix truck deliver, and a lot less work.
Volume of concrete required, in square feet = 27 x 4 x 0.5 = 54 cu ft, which is 2 cubic yards, so 80 dollars/pounds/yen/ringgit or whatever.
one (1) cubic yard of concrete four inches thick will cover 80 sq. feet. 85 yards x 81 = 6885 sq. feet.
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.
1 yard = 36 inches so 80 yards = 80*36 = 2880 inches.