conversations.from: human
conversations.value: This math problem has got me stumped: Thomas owns 200 books. He decides to sell them and use the money to buy records. Each book sells for $1.5. A record costs $3. If he buys 75 records, how much money does he have left over?
  Can you show me the way?
conversations.from: assistant
conversations.value: He makes $300 selling the books because 200 x 1.5 = 300
  He spends $225 on records because 75 x 3 = 225
  He has $75 left because 300 - 225 = 75