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Rugby and Ballet
Age 11 to 14
ShortChallenge Level 
The total mass of five rugby players is $425 \; \text{kg}$.
The average (mean) mass of ten ballet dancers is $40 \; \text{kg}$.
What is the average mass of all fifteen people?
This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.
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