20 times 50 divided by three is 333 1/3
9.3 cubic yards of cement is required for this slab.
5 yds - One yard of concrete will cover approximately 81 square feet 4" deep.
106.67 Cubic Yards
20 feet x 20 ft x .3333 ft = 133.33 cubic feet / 27 cubic feet per yard = 4.94 cubic yards
0.246914 cu. yards (6.666667 cu. ft ) of concrete is needed.
To calculate the amount of concrete needed for a 24ft by 20ft slab that is 4 inches thick, first convert the thickness to feet (4 inches = 1/3 feet). The volume in cubic feet is then 24ft × 20ft × (1/3)ft = 160 cubic feet. To convert cubic feet to cubic yards (since concrete is often sold by the cubic yard), divide by 27: 160 cubic feet ÷ 27 = approximately 5.93 cubic yards. Therefore, you would need about 6 cubic yards of concrete.
That depends on how DEEP you want the concrete !
66.666 square yards
For an area that is 20ft by 20ft and you want to add 6 inches of topsoil, you will need 20 cubic yards of topsoil. Topsoil is typically ordered by the cubic yard, so this measurement will ensure that you have enough to cover the entire area with a 6-inch layer.
20ft*4ft = 80 sq ft = 80/9 sq yards = 8.88... sq yards.
Cannot answer the question with out the depth dimension. If you are talking about square yards then 20x5 = 100 square feet, divided by 9 = 11.11 square yards,
15ft x 20ft= 5yards x 20/3yards 100/3 sq yards =33.3333333333 sq yards