answer = 30
Step-by-step explanation:
considering anyone out of 3 triangles as 120
then according to traingle law,
angle A + angle B + Angle C =180
so, lets say angle A as 120 and B and C as x.
so 120+ x +x = 180
so 120+ 2x = 180
so 2x = 180-120=60
so 2x =60
then x = 30
