A man runs his car out of gas thereby completely emptying his 16 gallon tank. He only has a 3, a 6, and a 11 gallon container (and fortunately a wagon to carry the containers in) in his trunk. He has nothing else in which he can carry gas. He walks a few miles to a gas station, and as luck would have it the gauge on the pump is broken so he can not use that to measure the fuel. He is in a pretty remote area with only one gas station for miles. Gas costs $3.09⁹, and he only has a $50. Using only the containers provided, and only walking once to and from the gas station, how can he get exactly 16 gallons of gas into his car?

Fill the 11.
Pay the man $34.10 an go back to your car.
Fill the 6 from the 11.
Pour the 5 from the 11 into the tank of your car
Drive the car to the gas station.
Pour the 6 back into the 11.
Fill the 11 and pour it into your tank.
Pay the man $15.50 and be on your way.

Posted by Axorion on 2007-11-18 04:46:48