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?
This must be the preferred solution:
Disregard the 3 gallon container
Fill the 6 gallon container and then pour it into the 11 gallon container
Carefully mark the 11 gallon container at the six gallon level
Top up the 11 gallon container
Refill the 6 gallon container from the 11 gallon container
Now pour petrol from the 6 gallon container into the 11 gallon container until you reach the 'six gallon mark'
Top up the 11 gallon container
You now have exactly sixteen gallons of petrol
solution to 'Out of gas'
