10 ft x 12ft x 72 inches/12 inches/foot = 720 cu ft
There is 105 pounds of gravel per cu ft, or
105* 720 = 75,600 pounds
At 2000 pounds per ton, that is 75600/2000 = 37.8 tons
22/7x6x6x6 cubic inches
33.5 cubic feet.
1 square foot = 144 square inches, so 100 square ft = 14400 sq inches. Multiply be 3 = 43200 cubic inches. I believe gravel is normally sold by the cubic yard. 1 cubic yard = (36 in)3 = 46656 cubic inches. So 43200/46656 = 0.926 cubic yards
.15
112 cuft
About 21 cubic feet
2.37 cubic yards.
0.148 cubic yard for every 3-inches deep
24 cubic feet . . . (6'x6'x 0.67')
8*5*1/2 = 20 cubic feet.
18 cubic feet 3 inches is 1/4 foot, so the volume is L x W x D = 8 x 9 x .25 = 18 cubic ft.
V = Length * Width * Hight V = 6 foot * 2 foot * 4 inches V = 6 * 12 inches * 2 * 12 inches * 4 inches V = 72 inches * 24 inches * 4 inches V = 6912 inches cubed OR V = 576 feet cubed You will need 6912 inches cubed OR 576 feet cubed