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.)

fill the 11 bucket

fill the 3 and 6 bucket with the 11 bucket(2 left in the 11 bucket)

empty 3 and 6

pour 2 left in 11 bucket into 3 bucket(or 6 bucket)

fill 11 bucket

you have 2+11=13 gallons of oil

Posted by Steven Lu on 2004-12-09 05:51:42