conversations.from: human
conversations.value: Sammy has 8 gifts to wrap. Each gift requires 1.5 meters of ribbon. Unfortunately, she has no available ribbon so Tom let her use his 15-meter long ribbon. How many meters of ribbon will be left from Tom's ribbon?
conversations.from: assistant
conversations.value: The eight gifts require 1.5 meters/gift x 8 gifts = 12 meters of ribbon.
  So, Tom will be left with 15 meters - 12 meters = 3 meters of ribbon.