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Age 11 to 14 Short Challenge Level:
The average temperature in 6 European cities is 5$^\circ$ Celsius.
What is the new average temperature, if two more cities, with temperatures of 12$^\circ$ Celsius and $-$6$^\circ$ Celsius, are added to the list?
This problem is adapted from the World Mathematics Championships
You can find more short problems, arranged by curriculum topic, in our short problems collection.
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.