conversations.from: human
conversations.value: Can you walk me through the solution of: It’s February 2021.  Mark was born in January 1976.  Graham is 3 years younger than Mark, and Graham’s sister, Janice, is 1/2 the age of Graham.  How old is Janice?
conversations.from: assistant
conversations.value: It’s 2021 and Mark was born in 1976 so Mark is 2021-1976 = 45 years old
  Graham is 3 years younger than Mark who is 45 so Graham is 45-3 = 42 years old
  Janice is 1/2 the age of Graham who is 42 so Janice is 42/2 = 21 years old