Answer
18.75 gallons
Work Step by Step
24 in=2 ft
20 in=$\frac{5}{3}$ ft
9 in=$\frac{3}{4}$ ft
V=2($\frac{5}{3}$)($\frac{3}{4}$)
V=2.5 ft$^3$$\times$7.5 gal per ft$^3$
V=18.75
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