The TV equals 20% because 1.1-4 years equals points
-20, -23, -26 (adding three)
Subtraction is the operation that you should is to solve this problem
You see how these 2 angles marked are both inside the 2 parallel lines?
And they are on opposite side of the transversal, the line crossing the 2 parallel lines?
These 2 angles are alternate interior angles and they are equal, I think you can do the last part by yourself.
You have to explain how you knew to use 55 and 120, not another option.
Hope it helped! :)