conversations.from: human
conversations.value: I'm completely lost with this math problem: Bill the miner discovers a vein of fool's gold. He successfully sells 8 ounces to a merchant, but when he tries to sell to the sheriff he's arrested, fined $50 and run out of town on a rail. If Bill earned $9 for every ounce of fool's gold he sold, how much money is he left with?
  Can you give me a hand?
conversations.from: assistant
conversations.value: First find the total amount of money Bill made from the merchant: 8 ounces * $9/ounce = $72
  Then subtract the fine to find how much money he was left with: $72 - $50 = $22