conversations.from: human
conversations.value: Marco loves trading cards. He has a total of 500 cards on hand, and a fourth of them are duplicates. Marco decides to trade one-fifth of these duplicates for completely new cards to his friend Josh. How many new cards did Marco get?
conversations.from: assistant
conversations.value: Marco has 500*0.25=125 duplicate trading cards.
  He wants to trade off 125*0.2=25 cards for new ones.