If the tank has a capacity of 27 cubic feet, then that capacity may be expressed as 201.97 gallons.
However, we have no way of knowing how much water is in it, if any.
1,468 US gallons.
300 cubic feet = 2,244.156 gallons (rounded)
1 cubic foot = 7.48051945 US gallons
There are 3 cubit feet in 1 cubit yard. Although irrelevant in this context, you may wish to know that 1 cubit = 1.5 feet = 0.5 yards.
Since imperial gallons are no longer in use, I assume that you mean US gallons. 20 x 40 x 5 gives 4,000 cubic feet. 8.33 gallons per cubit foot will give 33,333 us gallons.
How many imperial gallons is 30 cubic feet of water?
1,987 cubic feet = 14,860 gallons of water.
There are 8,483 gallons in 1,134 cubic feet of water.
4,088 cubic feet = 30,580 gallons of water.
31 cubic feet of water equates to ~231.9 gallons.
44,260 gallons of water.
58,168.52 gallons.