A man's car runs out of gasoline. His car tank holds exactly 13 gallons. He has three empty unmarked containers which can hold 3 gallons, 6 gallons, and 11 gallons. Using only these containers at the gas station, how can the man bring back exactly 13 gallons?

(He is not allowed to buy over 13 gallons and dispose of the extra.)

(In reply to maybe this? input please. by Amon)

I like it.  Displacing gasoline with a container inside a container: it's a great trick.

Posted by Tristan on 2005-05-12 00:01:23