About 7,100 gallons of water.
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Based on a rectangle. approx 20,250 gallons
If the bottom of the pool is a uniform gradient from one side of the rectangle to the other, then volume = 2625 cubic feet = 16351 gallons.
get the DEPTH and the UNITS OF MEASUREMENT, then go back to 1st class mathematics. you'll figure it out.
12cm*20cm = 240 cm2 = 37.2 sq inches = 0.258 sq ft
4 X 12 X 40 = 1920 cubic feet of water. 1 cubic foot of water = 7.48 gallons. 1920 cubic feet of water = 14,362.5 gallons