prompt: 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?
messages.content: 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?
messages.role: user
messages.content: John was 39-3=<<39-3=36>>36 years old 3 years ago
  So that means in 6 years James will be 36/2=<<36/2=18>>18 years old
  So right now James is 18-6=<<18-6=12>>12 years old
  So James's older brother is 12+4=<<12+4=16>>16 years old
  #### 16
messages.role: assistant