conversations.from: human
conversations.value: Jeff has 16 GB of storage on his phone. He is already using 4 GB. If a song takes up about 30MB of storage, how many songs can Jeff store on his phone? (There are 1000 MB in a GB).
  What is the solution?
conversations.from: assistant
conversations.value: Jeff has 16-4 = 12GB left over on his phone.
  Therefore, he has 12*1000= 12,000MB.
  Therefore, he can store 12,000/30=400 songs.