Does the sum of all exterior angles equal the sum of interior angles?

no, it adds up to 360. So in this question, since one angle has 40 degrees, the remaining ones have to add up to 320

Watch these 2 videos:https://www.khanacademy.org/math/geometry-home/geometry-shapes#angles-with-polygons

Thank you. So do exterior angles always add up to 360?

Thank you!

could you explain on how did you solve this problem??