Question

Me, you and him went to a restaurant. When the bill comes it was 30 pounds, so they decided to divide it equally. 10 each. When the owner of the restaurant saw it he gave it back 5 pounds because they were old customers. The waiter when delivering the change took for him 2 pounds giving for the customers 1 pound each. So...... Me - 10 pounds - 1 pound that was give it back = 9. You - 10 pounds - 1 pound that was give it back = 9. Him - bla bla bla the same thing. So...... 9+9+9 =27 plus the 2 pounds that the waiter took for him = 29 pounds. Where is the 1 pound? And why this is the wrong way?

Answer 1

the wrong way to do the calculus...

Answer 2

This is the classic "missing dollar" problem:

3 men go into a hotel.
The man behind the desk said the room is $30 so each man paid $10 and went to the room.
A while later the man behind the desk realized the room was only $25 so he sent the bellboy to the 3 guys' room with $5.
On the way the bellboy couldn't figure out how to split $5 evenly between 3 men, so he gave each man a $1 and kept the other $2 for himself.
This meant that the 3 men each paid $9 for the room, which is a total of $27 add the $2 that the bellboy kept = $29. Where is the other dollar?

Answer 3

So the short answer:

There is no missing dollar. The men spent $27. Of which $25 went on the room and $2 went to the light fingered bell boy. You can not add the $2 the bellboy has to the $27 the men spent as this $2 actually comes out of the $27 the men spent, the other $25 going on the room.

Put another way consider how the $30 breaks down:

$25 - room
$3 (3x $1) back to the men
$2 Bellboy

http://puzzles.nigelcoldwell.co.uk/twentyeight.htm

Answer 4

haha, in fact I saw in reals of Brazil but I converted, wrongly, to pounds. xD Thanks! I will take a look better on the website. xx