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That depends on what substance is in the 20 gallons. A gallon is a unit of volume, or capacity, or space.

It it's 20 gallons of air, it weighs very few pounds.

If it's 20 gallons of water, it weighs about 167 pounds.

If it's 20 gallons of stones or concrete or lead, it weighs a lot more pounds.

If it's 20 completely empty gallons, it weighs no pounds at all.

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14y ago

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