Question 13
In the diagram, $\triangle PQR$ is isosceles with $PQ=PR$ and $\triangle PRS$ is isosceles with $PS=SR=x$. Also, the perimeter of $\triangle PQR$ is 22, the perimeter of $\triangle PRS$ is 22 and the perimeter of $PQRS$ is 24. What is the value of $x$?
