conversations.from: human
conversations.value: Cindy has 37 envelopes. If Cindy gives 3 envelopes to each of her 5 friends, how many envelopes does she have left?
conversations.from: assistant
conversations.value: Cindy gave 3 envelopes/friend x 5 friends = 15 envelopes to her friends.
  Cindy has 37 envelopes - 15 envelopes = 22 envelopes left.