a gallon is 231 cubic inches, so:
36x16x6.5 / 231 = 16.2 gallons
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This is an 80 gallon tank.
179.52
Approx 18.18 US gallons. Here's how: 1 US gallon = 231 in³. So we have (14 in)(50 in)(6 in)/(231 in/gallon) = 18.18 gallons.
84.16 US gallons
About 47.6 gallons