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You did not specify what units those numbers are describing, but I'll assume you meant inches, seeing as a trash can that is 20 cm high would be quite small, and one that is 20 ft. or 20 m high would be excessively large.
Your trash can is 20*20*30= 12,000 cubic inches. A gallon is 231 cubic inches, so your trash can would hold 12,000/231= 51.948 gallons.
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