conversations.from: human
conversations.value: James buys 20 pounds of beef and half that much pork.  He uses 1.5 pounds of meat to make meals at his restaurant.  Each meal sells for $20.  How much money did he make?
conversations.from: assistant
conversations.value: He bought 20/2=10 pounds of pork
  So he has 20+10=30 pounds of meat
  That means he can make 30/1.5=20 meals
  So he makes 20*20=$400