Answer:
26 years old.
Step-by-step explanation:
First lets write an expression for this problem.
That will be 14 + 12 = x
You will do this because it says how the persons sister's age is 14. And the brother says that his age is 12 minus equal to his sister's age. So that's why you use that expression.
So 14 + 12 will give yo 26.
So that means the brother is 26 years old.
