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Answer: £11.50
The lunch bill and tip total £28, so Gill and I should both pay £14 each.
Gill has paid £25.50, so she has paid £25.50 - £14 = £11.50 too much.
So I should give her £11.50, and then I will have paid £2.50 + £11.50 = £14
Paying the Bill
Age 11 to 14
ShortChallenge Level 
Answer: £11.50
The lunch bill and tip total £28, so Gill and I should both pay £14 each.
Gill has paid £25.50, so she has paid £25.50 - £14 = £11.50 too much.
So I should give her £11.50, and then I will have paid £2.50 + £11.50 = £14
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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