conversations.from: human
conversations.value: I'm completely lost with this math problem: John buys a vacuum cleaner for $250 and a dishwasher for $450.  She has a $75 off coupon.  How much did he spend?
  Can you give me a hand?
conversations.from: assistant
conversations.value: The combined price was 250+450=$700
  So he paid 700-75=$625