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 $x$ ?
(A) 60
(B) 70
(C) 80
(D) 110
(E) 125

![](https://cdn.mathpix.com/cropped/2024_04_20_6027bc27089ed4fc493cg-003.jpg?height=271&width=407&top_left_y=1011&top_left_x=1268)
Since $\angle P Q R$ is a straight angle, its measure is $180^{\circ}$, and so $\angle S Q R=180^{\circ}-125^{\circ}=55^{\circ}$.

Since $S Q=S R$, then $\angle S R Q=\angle S Q R=55^{\circ}$.

The sum of the angles inside $\triangle S Q R$ is $180^{\circ}$, and so $x=180-55-55=70$.

ANswer: (B)