White shapes and black shapes are used in a game. Sone of the shapes are circles. All of the other shapes are squares. Tye ratio of the number of white shapes to the number of black shapes is 5:11. The ratio of the number of white circles to the number of white squares is 3:7. The ratio of the number of black circles to the nunber of black squares is 3:8. Work out what fraction of all the shapes are circles.