conversations.from: human
conversations.value: Lexie is 6 years older than her brother and her sister is twice her age. If Lexie is 8, what is the age difference between her brother and her sister?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: Lexie's brother is 8 - 6 = 2 years old.
  Her sister is 8 x 2 = 16 years old.
  The age difference between her brother and sister is 16 - 2 = 14 years.