conversations.from: human
conversations.value: Tom decides to make lasagna with all his beef.  It takes twice as many noodles as beef.  He has 10 pounds of beef.  He already has 4 pounds of lasagna noodles and the noodles come in 2-pound packages.  How many packages does he need to buy?
  How to solve this?
conversations.from: assistant
conversations.value: He needs 10*2=20 pounds of noodles
  That means he needs to buy 20-4=16 pounds of noodles
  So he needs to buy 16/2=8 packages