There are four people: Roberta, Thelma, both female and Steve and Pete, both male. Among them, they hold eight different jobs. Each holds exactly two jobs. The jobs are chef, guard, nurse, clerk, police officer, teacher, actor and boxer. The job of nurse is held by a male. The husband of the chef is the clerk. Roberta is not a boxer. Pete has no education past the ninth grade. Roberta, the chef and the police officer went golfing together. Who holds which jobs?
There are twelve billiard balls, eleven of which are identical in weight. The remaining ball -- the odd one -- has a different weight. You are not told whether it is heavier or lighter. You have a balance scale for weighing the balls. Can you find which ball is odd ball in three weighings, and can you also find out whether it is lighter or heavier than the others.