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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 !

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Q: How do you get the cubic feet of dirt is needed to fill a hole that is 20 feet wide and 15 feet long and 4 inches deep?
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