conversations.from: human
conversations.value: I'm stuck on this math problem: 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?
  Can you help?
conversations.from: assistant
conversations.value: 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.