About 16.
If the barrel is cylindrical in shape then its volume is 19113.4497 inches3 82.422 U.S. gallons. 68.897 Imperial gallons. The Imperial gallon is about 20% bigger than the U.S. gallon.
117 gallons
The formula for the volume of a cylinder is pi * r^2 * h. A cylinder of the specified dimensions would have a volume of very close to 4000 cubic inches. There are 231 cubic inches in a gallon, so that works out to slightly under 17 and a third gallons. That's a rather tall and skinny "barrel", by the way.
22.032 gallons (rounded)
200.7
7 gallons
Assuming it is a rectangle, 8.485 US gallons
The total volume is 26 649 cubic inches.Transformed in gallons equals 115,3636 gallons.
411.4 US gallons, approx.
1 gallon = 231 cubic inches. Multiply L X W X H (in inches) to get cubic inches, then divide by 231 to get gallons. 179.53 gallons
72 gallons.