9514 1404 393
Answer:
3042 in³
Explanation:
The dimensions of the water are ...
19.5 in long × 12 in wide × 13 in tall
The volume in cubic inches is ...
V = LWH
V = (19.5 in)(12 in)(13 in) = 3042 in³
_____
At 231 cubic inches per gallon, that's about 13.17 gallons.