conversations.from: human
conversations.value: Provide a step by step solution for the following math problem: There are 480 zombies in the shopping mall. If the number of zombies doubled every day, how many days ago were there less than 50 zombies in the mall?
conversations.from: assistant
conversations.value: First find how many zombies there were one day ago: 480 zombies / 2 = 240 zombies
  Then find how many zombies there were two days ago: 240 zombies / 2 = 120 zombies
  Then find the number of zombies there were three days ago: 120 zombies / 2 = 60 zombies
  Then find the number of zombies there were four days ago: 60 zombies / 2 = 30 zombies, which is less than 50, so there were less than 50 zombies 4 days ago.