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. 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.
1000s
32,000, $320.00
24 qts 1 gallon = 4 quarts 1 quart = 0.25 gallon
it depends on the size of your coin , so that answer is varys
the water will over fill
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.
1000s
mabey 2,000,000
30,000??
32,000, $320.00
The bottle and stone take up space that the water would need to fill (displaces it). If a tank takes 2 gallons with out the bottle the bottle may take up the space of half a gallon. When the water fills the tank following flushing the ball-cock still raises but the bottle replaces half a gallon. Therefore the ball-cock switches off the water in the normal height but using less water.
3.7854118 liters
16 halfpint cartons of water are needed to fill the gallon container
About $2300
24 qts 1 gallon = 4 quarts 1 quart = 0.25 gallon