you need 3,072 cubic feet of soil
about 432 cubic inches
22/7x6x6x6 cubic inches
108 cubic feet.
it depends how thickly you lay it.
218.75 cubic feet or 8.1 cubic yards
about 432 cubic inches
1 foot = 12 inches 20 ft * 7 ft can be expressed as 240 inches * 84 inches, then 240 in * 84 in * 2 in = 40320 inches cubed or 3360 cubic feet
22/7x6x6x6 cubic inches
53.2 fluid ounces of water.
108 cubic feet.
It would take 135 cubic feet = 5 cubic yards.
A volume of 453 cubic inches is filled by 1.961 gallons of water.
it depends how thickly you lay it.
218.75 cubic feet or 8.1 cubic yards
33.5 cubic feet.
29.45 cubic feet or 183.45 US gallons.
42.4 cubic feet = 1.6 cubic yards (rounded)