conversations.from: human
conversations.value: Djibo is 17 years old. Five years ago Djibo added his age with his sister's age and the sum was 35. How many years old is Djibo's sister today?
  What is the solution?
conversations.from: assistant
conversations.value: Age 5 years ago: 17 - 5 = 12
  Sister's age 5 years ago: 35 - 12 = 23
  Sister's age today: 23 + 5 = 28 years
  Djibo's sister is 28 years old today.