Answer:
Brain is 3 years old.
Explanation:
Let B represent Brain's age and D represent Dane's age.
We have been given that Dane is 10 times Brian's age. We can represent this information in an equation as:

We are also told that the difference in their age is 27. We can represent this information in an equation as:

Upon substituting equation (1) i equation (2), we will get:




Therefore, Brain is 3 years old.