Math Week: enigma of the school city


Here is the last riddle of the week proposed by the class of 6th A of the school city. The students were helped by their teacher Hélène Raux. You will find the results of all the puzzles next week.



The petrol station pump is out of order, but a customer absolutely needs 4 liters of petrol for his scooter.

To serve it, the clever pump attendant uses 3 containers that can contain:

- the first 11 liters;

- the second 13 liters;

- the third 6 liters.

The pump attendant can:

- fill each container with gasoline from the tank or from another


- empty each container into another or into the tank.

How will it measure 4 liters?


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