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Debt Recovery

Age 11 to 14 Short Challenge Level:

Tony owes Tina 40p.
Then Tina borrows 50p from Tony.
Later Tony lends Tina 60p.

Who has to pay what to whom to square things up?

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