conversations.from: human
conversations.value: Van Helsing gets paid by the town to remove all the vampires and werewolves. He gets $5 per vampire and $10 per werewolf. He removes half the vampires and removes 8 werewolves, and earned $105. There were 4 times as many werewolves as vampires. What percentage of the werewolves did he remove?
conversations.from: assistant
conversations.value: He earns $80 from werewolf removal because 8 x 10 = 80
  He earned $25 from vampire removal because 105 - 80 = 25
  He removed 5 vampires from town because 25 / 5 = 5
  There were 10 vampires because 5 / .5 = 10
  There were 40 werewolves because 4 x 10 = 40
  The proportion of werewolves that he removed was .2 because 8 / 40 = .2
  The percentage of werewolves removed was 20% because 100 x .2 = 20