A gallon is a traditional unit of liquid volume, derived from the Roman word 'galeta', which originally meant a 'pailful'.
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5 gallons.
The answer will depend on whether you mean UK pennies and the Imperial gallon or US pennies (which are actually cents) and a measure that is a smaller gallon, or a penny from some other country and yet another arbitrary measure which is called a gallon!
1 gallon = 1 gallon
1. Fill 4 gallon bottle 2. Pour IT into the 7-gallon bottle 3. Fill 4 gallon again, and pour IT into 7 gallon (leaves 1 gallon in 4 gallon bottle) 4. Empty 7 gallon 5. Pour the 1 gallon into the 7-gallon 6. Fill 4 gallon 7. Pour IT into the 7 gallon You now have 5 gallons in the 7-gallon bottle.
Fill up the three gallon jug and pour it into the five gallon jug. Refill the three gallon jug and pour from it into the five gallon jug until it is full. What remains in the three gallon jug will be one gallon.