20 lbs takes us 0.2 cubic feet; a yard is 27 cubic feet; that would take 27/.2 = 135 bags. That is a lot of bags, with total weight of 2700 pounds
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120 50-pound bags.
40 pounds of topsoil is about 2 cubic feet, which will cover an area of 12 square feet at 2 inches deep.600 square feet divided by 12 square feet per bag is 50 bags.Answer50 bags
11/2
4.5 "six square foot" bags equal a cubic yard (27 cubic feet) of volume capacity.
It is not possible to answer the question without knowing the density (specific gravity) of the mayerial. The more dense the substance, the fewer bags you will need.