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The mass of insects caught by spiders in a year in the UK is approximately equal to the mass of the human population of the UK.
Assuming this population is 60 million and the average mass of a human is 70 kg, what is the mass, in tonnes, of insects caught by spiders per year in the UK?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
Caught in the Web
Age 14 to 16
ShortChallenge Level 
The mass of insects caught by spiders in a year in the UK is approximately equal to the mass of the human population of the UK.
Assuming this population is 60 million and the average mass of a human is 70 kg, what is the mass, in tonnes, of insects caught by spiders per year in the UK?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.