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540 feet2
32 cubic ft.
8*5*1/2 = 20 cubic feet.
15 * 5 * 0.5 = 37.5 cu ft. or 1.39 cu yards.
8 ft * 10 ft * 0.5 ft = 40 cubic feet
72 cubic feet
18ft³
540 feet2
32 cubic ft.
8*5*1/2 = 20 cubic feet.
15 * 5 * 0.5 = 37.5 cu ft. or 1.39 cu yards.
8 ft * 10 ft * 0.5 ft = 40 cubic feet
4 x 6 x .75 = 18 cu ft of sand
It will take 72 sq. ft. of sand. Or 2.66 sq. yds. That will fill the box even.
2.37 cubic yards of dirt is needed to fill an 8'X4' that is 24" deep garden box. If the box is filled 12 inches, the amount of soil needed is 1.19 cubic yards and that should be deep enough for most vegetables.
All you have to do is find the maximum volume of your sandbox. To do this, multiply the length (6 ft.) by the width (6 ft.) by the depth (10 ft.). 6 x 6 x 10 = 360 cubic feet This is if you want to fill the sandbox to the brim. If you want something about half the depth so that the sand isn't falling out everywhere, you just multiply: 6 x 6 x 5 = 180 cubic feet
More information is needed in order to answer this question. The size of the pond, preferably in square meters.