User:Martin Hogbin/lost pound

Three people enjoy a meal at a Thai restaurant. The waiter brings the bill for £30 so each person pays £10. Chef

Later the chef realises that the bill should have only been £25 so he sends the waiter back to the table with £5. The waiter was not very good at Maths and could not figure out how to divide the £5 so he gave each person a £1 and kept £2 for himself.

So....the three people have paid £9 each for the meal. 3 x £9 = £27

The waiter kept £2 £27 + £2 = £29

What happened to the other pound? Does this make sense?