Solution: My brother said, "I will be as old as you in three years." Caption: My brother is three years older than my brother.

My brother said, "I will be twice your age in three years." In this way, the elder brother is older than the younger brother: (3+3) = 6 years old, which is what the elder brother thinks.

Brother's age: 6 ~ 2- 1 ~ = 6 years old.

Brother's age: 6+3 = 9 years old.