SOLUTION: 3 friends had 10bob each, they bot lunch of 25bob, they paid 30bob and were given 3bob each because there was no 5bob, they gave him the 2bob tip. my question if each gave out

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Question 884950: 3 friends had 10bob each, they bot lunch of 25bob, they paid 30bob and were given 3bob each because there was no 5bob, they gave him the 2bob tip.
my question
if each gave out 10 bob and was given back 1bob, each spend 10-1=9
9x7= 27, the waiter was given a tip of 2bob, where did the 1bob go?

Answer by JulietG(1812) About Me  (Show Source):
You can put this solution on YOUR website!
This is a classic brainteaser.
.
Did you figure it out?
The solution is here, but try to wrap your head around it first.
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Clever little thing.