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Paper Weight

Age 11 to 14 Short Challenge Level:

The graph shows how the weight of a letter (including the envelope) varies with the number of sheets of paper used.

graph of weight of letter against number of sheets of paper

What is the weight of a single sheet of paper?

 

This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.