Answer:
100
Step-by-step explanation:
We are given that ABC is similar to ZXY
This means Angle A is similar to Angle Z, Angle B is similar to Angle X and Angle C is similar to Angle Y.
Let's assume ABC is congruent to ZXY.
Angle A + Angle B + Angle C = 180
We can substitute Angle X for Angle B as they are congruent
Angle A + Angle X + Angle C = 180
50 + Angle X + 30 = 180
80 + Angle X = 180
Angle X = 100
