Someone told me this in the pub the other day and it's a good un 
Three blokes reserve a Hotel room for £30. They club together and each contribute a £10 note. When they get there, they pay the manager the £30 and go up to the room to unpack.
In the meantime, the manager realises he's made a mistake with the tariff, and he should have only charged them £25. Being an honest chap, he calls one of the porters, gives him five £1 coins and tells him to return this to the aforementioned gentlemen with his apologies.
As the porter's going up in the lift he wonders how he's going to divide the £5 three ways, so being a dishonest chap (and a bad mathematician) he decides to keep some for himself.
He goes to the room, says there's been a mistake, gives each of the three men a £1 coin each, pockets the remaning two £1 coins out of the five the manager gave him and leaves.
Ok, so the men each initially paid £10 each, they each got £1 back from the porter, so they ended up paying £9 each, and the porter nicked £2.
£9 x 3 = £27, add on the Porter's £2 , and that makes £29.
Where's the other £1 gone???????
Three blokes reserve a Hotel room for £30. They club together and each contribute a £10 note. When they get there, they pay the manager the £30 and go up to the room to unpack.
In the meantime, the manager realises he's made a mistake with the tariff, and he should have only charged them £25. Being an honest chap, he calls one of the porters, gives him five £1 coins and tells him to return this to the aforementioned gentlemen with his apologies.
As the porter's going up in the lift he wonders how he's going to divide the £5 three ways, so being a dishonest chap (and a bad mathematician) he decides to keep some for himself.
He goes to the room, says there's been a mistake, gives each of the three men a £1 coin each, pockets the remaning two £1 coins out of the five the manager gave him and leaves.
Ok, so the men each initially paid £10 each, they each got £1 back from the porter, so they ended up paying £9 each, and the porter nicked £2.
£9 x 3 = £27, add on the Porter's £2 , and that makes £29.
Where's the other £1 gone???????
