How about this one:
Three hotel guests stay together. They receive a bill for $30. They each put $10 on the table, which the bellhop collects and takes to the till. The cashier informs the bellhop that the bill should only have been for $25 and returns $5 to the bellhop in $1 bills. On the way back to the room the bellhop realizes that he cannot divide the bills equally between the guests. As they didn’t know the total of the revised bill, he dishonestly decides to put $2 in his own pocket and give each of the guests $1.
Now that each guest has been given a dollar back, each of them has paid $9. Three times 9 is 27. The bellhop has $2 in his pocket. Two plus 27 is $29. The guests originally handed over $30. Where is the missing dollar?
There is no missing dollar.
You shouldn't be
adding the $2, you need to
subtract it. Remember, the total is $25, not $30. Therefore, each guest paid $9 x 3 = $27 - the stolen $2 = $25.
EDIT: Darn, too slow. I heard that one years ago, but it took me a minute to remember the answer!
Has anyone figured out this sequence yet?
Give the next two numbers in this sequence: 9, 10, 11, 12, 13, 14, 21, ...