conversations.from: human
conversations.value: Randy has some money. He spent $10 buying his lunch. He spent a quarter of the money he had left on an ice cream cone. If the ice cream cone cost $5, what is the amount of money, in dollars, Randy had at first?
conversations.from: assistant
conversations.value: Randy has 5*4=20 dollars left after buying lunch.
  Randy had 20+10=30 dollars at first.