Question 874847
Exterior angle = the sum of angles A and B.

120 = 2x + x+15

120 = 3x + 15

120-15 = 3x

105 = 3x

105/3 = 35

Angle A = 2(35)

Angle A = 70°

Angle B = 35 + 15

Angle B = 50°