Lizzy: Gabriel is 3 years younger than Frank. The current total of their ages right now is 17. What is Frank's age?.
Me: Hmmm, let me think. I think this is the detailed solution:
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. Final answer: 10.