In a gallon 2,478 pennies or 5252 nickels would fit. In a 5 gallon jug, 30,294 pennies, 26,262 nickels or 16,000 quarters. More.
A penny weighs 1/10 of an oz. , so it would take 1,280 to weigh as much as a gallon of water (128 oz. ).
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