conversations.from: human
conversations.value: Gabriel is 3 years younger than Frank. The current total of their ages right now is 17. What is Frank's age?
conversations.from: assistant
conversations.value: Let X be Frank's age.
  So Gabriel is X-3 years old.
  The total of their ages is X + (X-3) = 17 years old.
  2X-3 = 17
  2X = 20
  X = 10
  So Frank is X = 10 years old.