A 5 gallon water bottle filled with penny's, how much money is in the bottle?

Answer 1

Since the pennies can be in any arrangement, and take up any amount of space, or there can be a balloon in the center of the bottle, there is no way of knowing.

If this is not a contest and you have a bottle of pennies then bring it to commerce bank, and put it in the penny arcade. It is a free way to exchange your coins for bills without having to count them.