conversations.from: human
conversations.value: Kyle is 5 years older than Julian. Julian is 20 years younger than Frederick. Frederick is 2 times older than Tyson. If Tyson is 20, how old is Kyle?
  Give me a clear explanation.
conversations.from: assistant
conversations.value: Frederick is 20 * 2 = 40 years old
  Julian is 40 - 20 = 20 years old
  Kyle is 20 + 5 = 25 years old