conversations.from: human
conversations.value: Can you explain how to solve this math problem: Jake agrees to work part of his debt off.  He owed someone $100 but paid them $40 before agreeing to work off the rest.   He worked for $15 an hour.  How many hours did he have to work?
conversations.from: assistant
conversations.value: He has to work off $100-$40=$60.
  So he has to work $60/15=4 hours