conversations.from: human
conversations.value: Break down this math problem: John is trying to save money by buying cheap calorie-dense food.  He can buy 10 burritos for $6 that have 120 calories each.  He could also buy 5 burgers that are 400 calories each for $8.  How many more calories per dollar does he get from the burgers?
conversations.from: assistant
conversations.value: The burritos have 10*120=1200 calories
  That means he gets 1200/6=200 calories per dollar
  The burgers get 5*400=2000 calories
  So he gets 2000/8=250 calories per dollar
  So he gets 250-200=50 more calories per dollar from the burgers