Junior Mathematical Olympiad 2006 Section B Q13

In this diagram, $Y$ lies on the line $AC$, triangles $ABC$ and $AXY$ are right angled and in triangle $ABX$, $AX=BX$. The line segment $AX$ bisects angle $BAC$ and angle $AXY$ is seven times the size of angle $XBC$. What is the size of angle $ABC$?