3 men go to buy a watch. Split the cost into 3. The person there says it costs 60. So they pay 20 ea. then the owner comes and says its only 50. Go return 10, he decides to keep four to himself. And gives them ea. 2, but the lost is now 18x3 which is 54. Plus the 4 in his pocket I becomes 58. What happened to the 2? Didn't it equal 60?