conversations.from: human
conversations.value: Tim owns rental properties.  He decides to replace all the locks and needs to get 3 keys per lock.  He owns two apartment complexes which each have 12 apartments.  How many keys does he need to make?
  Solve it.
conversations.from: assistant
conversations.value: There are 2*12=24 apartments he needs keys for
  So he needs 24*3=72 keys