conversations.from: human
conversations.value: Please show me the solution for: Mel is three years younger than Katherine.  When Katherine is two dozen years old, how old will Mel be in years?
conversations.from: assistant
conversations.value: When Katherine is 2 dozen years old, she will be 2*12=24 years old.
  If Mel is three years younger than Katherine, then when Katherine is 24 years old, Mel will be 24-3=21 years old.