Each forked out $10.
They ordered a meal that cost $25 altogether.
The waiter thus returned them $5.
But $5 is hard to divide between 3 friends.
So the waiter took $2 from the $5 change and gave each of the friends $1 each.
Therefore the 3 friends actually spend $9 (because $10 - $1)
So the 3 friends in total paid $27(3 x $9)
The waiter kept $2
Therefore in total its $27 + $2 = $29
So... where did the $1 go?
[been trying to figure this question for days... I am not even sure if it can be solved. But if you can then thanks very much! :D]
EDIT: Yes, and I got it. Thanks for the all the help.