This may be an old one, but many people seem not to have heard it. Samantha and Suzy were squabbling over a small cake. Their mother solved the question of which one should cut it, as well as the problem of how to make sure the pieces were even, in a very simple manner. No one could complain. What was her solution?
REVEAL THE ANSWER
One sister was allowed to cut the cake in two, and the other got first choice of the two pieces.