conversations.from: human
conversations.value: Trevor's older brother was twice his age 20 years ago. How old was Trevor a decade ago if his brother is now 32 years old?
conversations.from: assistant
conversations.value: If Trevor's brother is 32 years old today then 20 years ago he was = 32-20 = 12 years old
  If Trevor's brother was 12 years old and he was twice Trevor's age, then Trevor was 12/2 = 6 years old
  If Trevor was 6 years old 20 years ago, then he must be 6 + 20 = 26 years old today
  If Trevor is 26 years old today then a decade ago he must have been 26-10 = 16 years old