conversations.from: human
conversations.value: Bobby can deadlift 300 pounds at 13.  When he is 18 he can deadlift 100 pounds more than 250% of his previous deadlift.  How many pounds did he add per year?
  Solve it.
conversations.from: assistant
conversations.value: His new deadlift is 300*2.5+100=850 pounds
  So he added 850-300=550 pounds to his deadlift
  This took 18-13=5 years
  So he added 550/5=110 pounds per year