20' x 21' x 36" = 47 cubic yards, but
20' x 21' x 4" is only 15.67 cubic yards.
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Half a cubic foot.
about 432 cubic inches
1500 x 3 = 4500 cubed ft
You need (182/3) divided by (cubic feet of mulch in each bag) bags.
Volume = 50-ft x 5-ft x 1/4-ft = 62.5 cubic feetYou'll need(62.5)/(cubic feet of mulch in each bag) bags.