A gallon is a measure of volume (3-dimensional), a square foot is a unit of area (2-dimensional). You can't convert between them.
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If the oil is barely visible it would take something like 25 gallons to cover one square mile. If the appearance of the oil is of bright bands of colour, then 200 gallons per square mile. Thick oil spills amount to 1330 gallons per square mile
381 gallons of oil divide by 21 gallon containers = 18 full containers which will use 378 gallons of oil. Container 19 will have only 3 gallons in it.
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1 oild and one gallon
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