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Answer: 240g

There are 100 5p's in £5.

The old coins weighed $100 \times 5.65 = 565$g, while the new coins weigh $100 \times 3.25 = 325$g.

So your pocket is $565-325=240$g lighter.



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