All you need to do is multiply the length by the width, and it doesn't matter in what order you do it. 20ft X30ft= 600 square feet.
15ft x 20ft= 5yards x 20/3yards 100/3 sq yards =33.3333333333 sq yards
20ft x 10ft x 7ft = 1400 cubic feet 1 yard of dirt = 27 cubic feet Hence yards required = 1400/27 = 51.85
20ft equals 609.6cm (30.48cm per ft).
20 * 18 / 9 = 40 square yards (the divided by nine is because there are exactly nine square feet in one square yard)
All you need to do is multiply the length by the width, and it doesn't matter in what order you do it. 20ft X30ft= 600 square feet.
9.3 cubic yards of cement is required for this slab.
20ft*4ft = 80 sq ft = 80/9 sq yards = 8.88... sq yards.
20 feet x 20 ft x .3333 ft = 133.33 cubic feet / 27 cubic feet per yard = 4.94 cubic yards
15ft x 20ft= 5yards x 20/3yards 100/3 sq yards =33.3333333333 sq yards
20 times 50 divided by three is 333 1/3
20ft x 10ft x 7ft = 1400 cubic feet 1 yard of dirt = 27 cubic feet Hence yards required = 1400/27 = 51.85
5 yds - One yard of concrete will cover approximately 81 square feet 4" deep.
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.
That depends on how DEEP you want the concrete !
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,
If that is 20ft by 20ft then there are 400 square feet