Given the following reasoning and answer, what was the question? Barbara is currently 16 years / 2 = 8 years old. Mike is going to be 24 years old after 24 years - 16 years = 8 years. So Barbara is going to be 8 years + 8 years = 16 years old.
The answer: 16
The question Mike is 16 years old. His sister Barbara is half as old as he is. How old is Barbara going to be when Mike is 24 years old?