Question 1085218
Supplementary angles add to 180 degrees. 

I'm guessing there are 3 angles. other angles are x given is y

180= 2x+y

3x=y       Substitute 3x for y 

180=5x 
x=36            Each other angle is 36 degrees so two others (if there's only 3) is 72 degrees.

180-72=y

y=108      Given angle is 108 degrees.