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.
Using that fill the 3 & 6, leaving 2 in the 11.
Put the two in the car.
Empty the 3 & 6 into the eleven, and fill the rest up from the pump.
Put the eleven into the car.
2 + 11 = 13, and there is no gasoline wasted.
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Posted by Lewis
on 2003-06-19 09:44:19 |
Solution
