A man has to get a fox, a chicken, and a sack of corn across a river. He has a rowboat, and it can only carry him and one other thing. If the fox and the chicken are left together, the fox will eat the chicken. If the chicken and the corn are left together, the chicken will eat the corn. How does the man do it?
The man and the chicken cross the river (the fox and corn are safe together). He leaves the chicken, rows back, takes the fox across, brings the chicken back, rows the corn across and leaves it with the fox, then returns one last time for the chicken.
