50x100x4 = 20,000 cubic inches
36 inches in a yard
20,000/36 = 555 5/9 cubic yards.
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How many square yards in a 20x18 feet 3 inches thick
one (1) cubic yard of concrete four inches thick will cover 80 sq. feet. 85 yards x 81 = 6885 sq. feet.
1.62
16 * 20 = 320 sq ft. at 4" thick concrete will cover 80 sq ft. 320 / 80 = 4 yards.
Assuming 4 inches thick, about 65.19 yards or rounded 66 yards (always round up to nearest yard).