Container weight = 100 lbs. If a gallon of liquid is 5 lbs and a 100 gallon container is missing 5 gallons how much would the container weigh?

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Would it change if the container was in different shapes? Cylinder or rectangle? Could volume effect the weight?
Container weight = 100 lbs. If a gallon of liquid is 5 lbs and a 100 gallon container is missing 5 gallons how much would the container weigh?
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