If there is dirt in a hole of the specified dimensions, you weren't very successful at digging the hole.
5,734.8 gallons.
I think it is 27 feet
Litre
None
None! If there was dirt in it then it wouldn't be a hole.
cylinder 18 feet diameter x 1.5 feet deep volume = 381 cubic feet
There is no dirt in a hole that is 3 feet deep and six inches in diameter.
none there is no dirt in a hole
none.
27
None but the hole can be filled in with dirt with the given dimensions.
There is 98.17477042 cubic feet of dirt in a 5 foot deep hole that is 5 foot across.
None. If it's a hole, then the dirt has been removed.
"3 feet round" is not clearly defined: is that the radius, the diameter, or the circumference?
1.963 cubic feet
As it is a hole there is no dirt in it. However, a cylinder of dirt with radius 1.5ft, depth 5ft and a volume of πr2h ~= 35.34 cu ft has been removed.