Answer:
Bianca is 9 years old.
Explanation:
Definition:
Age: The amount of time that has passed since something was born or created.
Answer:
In order to find Bianca's age, we can use the following equation:

We know that Bianca's sister is 27 years old, so we can plug or substitute this value into the equation to get:

Bianca's age = 9 years
Therefore, Bianca is 9 years old.