Math Puzzles and Games
8. A military car carrying an important
letter must cross a desert. There is no petrol station on the
desert and the car has space only for petrol that lasts to the
middle of the desert. There are also other cars that can
transfer their petrol into one another. How can the letter be
delivered?
Solution: There are 4 cars needed, including the car with the
important letter (which travels to the middle of the desert).
Its empty tank must be filled to the top to get to the end of
desert. The way between the military base (where the cars and
petrol is) and the middle of the desert can be divided into 3
thirds. 3 cars will go in their thirds back and forth and over
spilling 1/3 of their tanks. This way the tank of the important
car will be filled and the letter will be delivered.
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