How to get an IQ Test?

A riddle,Supposedly this is given as a IQ test in Japan. I have no idea if that’s accurate.How do you get them across? See comments.

• Supposedly this is given as a IQ test in Japan. I have no idea if that’s accurate.There are 8 people who have to cross the river on a raft.1. Policeman2. Thief3. Father4. Boy 15. Boy 26. Mother7. Girl 18. Girl 2The rules are:Only two people can cross at a time.Only the adults can operate the raft.The father can’t be with the girls unless the mother is there.The mother can’t be with the boys unless the father is there.The thief can’t remain with anyone unless the policeman is present.How do you get them all across?

• Answer:

  Father takes one boy, then goes back Father takes second boy, then goes back , father takes mother Mother goes back takes one girl Mother goes back takes second girl Mother goes back takes policeman Policeman goes back takes thief *it says the thief can't be alone with 'anyone' other than the policeman, it does not say the thief cannot be alone.