I used to love giving people simple puzzles, so here is one for you:

Three people go into a restaurant.

They each eat and the total bill is £30, so they pay £10 each (3 x 10 = 30) and leave.

After leaving, the manager realises he has charged them £5 too much, so sends the waiter after them.

The waiter realises splitting £5 between three is tricky, and besides, he got no tip, so he keeps £2 and gives each person £1 back.

That means each person paid £9.

3 x £9 = £27

Add the waiter’s tip: £27 + £2 = £29

So, where has the other pound gone?

Answer in a couple of days…