conversations.from: human
conversations.value: Find the answer to this math problem: If Beth is 18 years old and her little sister is 5, in how many years would she be twice her sister's age?
conversations.from: assistant
conversations.value: The age difference between Beth and her sister is 18 - 5 = 13 years.
  Beth must be 13 x 2 = 26 to be twice her sister's age.
  Beth will be twice her sister's age in 26 - 18 = 8 years.