This is a great problem solving puzzle.  My students and I in Oxford worked on this one during our Advisory Period.  Give it a go – a great stretch of the brain.  Click on the image to link out.

The Rules:

The group consists of a woman and two girls, a man and two boys, and a policeman with a thief. If you leave certain people alone with others, trouble will ensue. For example, the thief will only behave if the policeman is on the same bank.

• A maximum of two people can be on the raft at a time.
• One adult must be on the raft to operate it.
• The man cannot be with any of the girls without the woman present.
• Conversely, the woman can’t stay with the boys without the man there.
• The thief must be with the policeman or be alone.