about 432 cubic inches
.21 yards of sand will fill an area 115 inches by 67 inches to a depth of 2.5 inches.
22/7x6x6x6 cubic inches
None, as a hole which is 6 inches wide and 42 inches long has no depth and thus no volume.
6,400 ft3
Depends on the length of the hole.
18.6240 yd³
42 cubic feet or 1.56 yards.
.21 yards of sand will fill an area 115 inches by 67 inches to a depth of 2.5 inches.
22/7x6x6x6 cubic inches
None, as a hole which is 6 inches wide and 42 inches long has no depth and thus no volume.
6,400 ft3
509.7 litres
How deep? 1 inch will take .7 yards
29.45 cubic feet or 183.45 US gallons.
25 feet is equal to 300 inches. The radius of a hole is half its diameter, which equals 4 inches. The volume of the cylinder is given by the formula v = [Pi]r2h, so the volume of your hole is 3.14 * 16 * 300 = 15080 cubic inches. There are 1728 cubic inches to the cubic foot, so you'll need about 8.75 cubic feet of concrete, which is about a third of a yard. (More exactly, that's a cubic yard, but concrete guys just say "yard.")
Depends on the length of the hole.
33.5 cubic feet.