conversations.from: human
conversations.value: Roman the Tavernmaster has $20 worth of gold coins. He sells 3 gold coins to Dorothy. After she pays him, he has $12. How many gold coins does Roman have left?
  Work out the solution step by step.
conversations.from: assistant
conversations.value: Dorothy paid $12 for 3 gold coins so each gold coin is worth $12/3 = $4
  The Tavern master originally had $20 worth of gold coins which is $20/$4 = 5 gold coins
  He gave 3 out of 5 gold coins to Dorothy so he now has 5-3 = 2 gold coins left