conversations.from: human
conversations.value: I would love to understand how to solve this problem: Bo is learning words for the GRE.  He got 800 flashcards.  He knew 20% of the words on them.  He has 40 days to learn the rest.  How many words does he need to learn a day?
  Can you explain?
conversations.from: assistant
conversations.value: He knows 800*.2=160 words
  So he needs to learn 800-160=640 words
  That means he needs to learn 640/40=16 words per day