Given the rationale, provide a reasonable question and answer. Step-by-step reasoning process: Let X be my age now. In ten years, I'll be X + 10 years old. In ten years, my brother will be (X + 10) * 1 / 2 years old. In ten years, (X + 10) + (X + 10) * 1 / 2 = 45. So (X + 10) * 3 / 2 = 45. X + 10 = 45 * 2 / 3 = 30. X = 30 - 10 = 20 years old.
 The question and answer:
In ten years, I'll be twice my brother's age. The sum of our ages will then be 45 years old. How old am I now?
The answer is 20