conversations.from: human
conversations.value: A lumberjack is chopping down trees so he can sell firewood. Each tree he chops produces 4 logs each, and each log is then chopped into 5 pieces of firewood. If the lumberjack has chopped 500 pieces of firewood, how many trees did he chop down?
  Give me a clear explanation.
conversations.from: assistant
conversations.value: The firewood is made from 500 pieces of firewood / 5 pieces of firewood per log = 100 logs.
  So the logs are chopped from 100 logs / 4 logs per tree = 25 trees.