Lizzy: 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?.
Me: Hmmm, let me think. I think this is the detailed solution:
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. Final answer: 21.