conversations.from: human
conversations.value: Find the answer to this math problem: John has just turned 39.  3 years ago, he was twice as old as James will be in 6 years.  If James' older brother is 4 years older than James, how old is James' older brother?
conversations.from: assistant
conversations.value: John was 39-3=36 years old 3 years ago
  So that means in 6 years James will be 36/2=18 years old
  So right now James is 18-6=12 years old
  So James's older brother is 12+4=16 years old