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20' x 21' x 36" = 47 cubic yards, but 20' x 21' x 4" is only 15.67 cubic yards.
$36 x .20 ------ $7.20
21/36 x 100 = 58.3 recurring (that is, 58.3333..) percent.
x + 21 = 36Subtract 21 from each side:x = 15
7/12 x 36/1 = 252/12 = 21 or 21/1