conversations.from: human
conversations.value: If I'm 4 times older than Billy currently, and Billy is 4 years old, how old was I when Billy was born?
  Give me a clear explanation.
conversations.from: assistant
conversations.value: I would currently be 4*4=16 years old, since I'm 4 times older than Billy's age of 4.
  Therefore, in order to find my age at Billy's birth we'd simply subtract Billy's age of 4 from my age, meaning I was 16-4= 12 years old