Well, let's get down right now to some math, shall we?
Volume = 20 ft x 50 ft x 4 in = 240 in x 600 in x 4 in = 576000 in cubed.
1 cubic yard = 3 x 3 x 3 cubic feet (27 cubic feet)
1 cubic feet = 12 x 12 x 12 cubic inches (1728)
576000 cubic inches / 1728 cubic inches (in a yard) = 333.33 cubic yards.
You need 8 yards of sand that is 16 foot wide and 2 inches deep which is a volume of 8 x 16/3 x 2/36 ~= 2.37 cubic yards of sand.
2.37 cubic yards.
2.37 cubic yard
6,400 ft3
None because it's a hole but 6 cubic yards of dirt will fill it up.
50 x 5 x 0.33333r = 83 cubic yards
You need 8 yards of sand that is 16 foot wide and 2 inches deep which is a volume of 8 x 16/3 x 2/36 ~= 2.37 cubic yards of sand.
2.37 cubic yards.
2.37 cubic yard
If you say 2 inches deep, I assume you really mean cubic yards, as in how much you would have to buy? If so, the answer is 7.77, so you would need about 8 yards.
6,400 ft3
509.7 litres
About 3 yards with a little left over. 2.78 yards.
None because it's a hole but 6 cubic yards of dirt will fill it up.
12 yards is 432 inches.
6 yards = 216 inches
Sorry the first answer was in square yds. Cubic yards would be 0.308639