GAUSS8 2023 Problem 12

In the diagram, P Q R is a line segment, \angle P Q S=125^{\circ}, \angle Q S R=x^{\circ}, and S Q=S R. What is the value of x ?
gauss8 2023 12

Answer Choices
A. 60
B. 70
C. 80
D. 110
E. 125