This problem gets easy quickly if you put everything in the same units. When you see 4 inches, think of one third of a foot. Fifteen feet times a third of a foot gives five square feet. Multiply 5 by 20, 100 cubic feet.
If you are going to get the dirt by digging it from compacted soil, get 100 cubic feet. If you are getting loose dirt, better get 120 cubic feet - it will settle !
1 foot by 36 sq feet = 36 cubic feet of dirt is needed
10*13*3 = 390 cubic inches.
24 x 8/12 = 16 cubic feet.
6,400 ft3
806.66 Cubic Yards
1 foot by 36 sq feet = 36 cubic feet of dirt is needed
10-1/2 cubic yards
10*13*3 = 390 cubic inches.
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.
You will need 1500 cubic feet.
24 x 8/12 = 16 cubic feet.
29,040 cubic feet of dirt.
6,400 ft3
806.66 Cubic Yards
The formula for the volume is length * height * depth (or width) = 33 =3*3*3 = 27 cubic feet, but the answer to the question is 0; there's no dirt in a hole... We are not digging a hole here; we are building a mini-mastaba that is 1 foot deep above the original ground level. 48 cubic feet of dirt is required which equals 48/27 = 1.78 cubic yards of dirt.
1,728 cubic inches of it
The total volume is 1568 cubic inches, so 1000 cubic inches of dirt will fill about 2/3 of the container