In the triangle PQRPQRPQR, the point SSS is on the edge QRQRQR. ∠QPS=∠SPR\angle QPS = \angle SPR∠QPS=∠SPR, PQ=PS=SRPQ = PS = SRPQ=PS=SR and ∠PRQ=x∘\angle PRQ = x^\circ∠PRQ=x∘. What is the value of xxx?(A) 303030 (B) 333333 (C) 363636 (D) 404040 (E) 454545