conversations.from: human
conversations.value: Nick is 13 years old. His sister is 6 years older and their brother is half their combined age. How old would their brother be in 5 years?
  Work out the solution step by step.
conversations.from: assistant
conversations.value: Nick's sister is 13 + 6 = 19 years old.
  Their combined age is 19 + 13 = 32 years old.
  Their brother is 32/2 = 16 years old.
  In 5 years, their brother would be 16 + 5 = 21 years old.