None, to work out cubic feet you need three dimensions, 3 feet x 20 feet is 60 square feet, to get to cubic feet you need another dimension.
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20 x 20 x 3/12 = 100 cu ft at 100 lb/cu ft = 100 x 100 = 10000 pounds = 5 tons
Volume is 30 x 20 x 1/6 ie 100 cu ft. 27 cu ft make one cu yd so 100/27 ie 3.7 cu yds to one significant figure.
One is an area and the other is a volume, so there is no answer.
36-ft x 24-ft x 20-ft = 17,280 cubic feet
depends on how deep you want the nuggets. at 2" (or .17ft) thick: 12 x 16 = 192 sq ft area 192 sq ft x .17ft thick = 32.64 cu ft 32.64 cu ft / 2 cu ft = about 17 bags.