conversations.from: human
conversations.value: Solve the math problem: John has 3 bedroom doors and two outside doors to replace.  The outside doors cost $20 each to replace and the bedroom doors are half that cost.  How much does he pay in total?
conversations.from: assistant
conversations.value: The outside doors cost 2*$20=$40
  Each indoor door cost $20/2=$10
  So all the indoor doors cost $10*3=$30
  That means the total cost is $40+$30=$70