conversations.from: human
conversations.value: Alvin is 30 years old and Simon is 5 years away from being 1/2 the age of Alvin.  How old is Simon?
  Work out the solution step by step.
conversations.from: assistant
conversations.value: 1/2 the age of Alvin who is 30 is 30/2 = 15
  Simon is 5 years away from being half the age of Alvin so Simon is 15-5 = 10 years old