White shapes and black shapes are used in a game. some of the shapes are circles. all the other shapes are squares. the 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 number of black squares is 3: 8. work out what fraction of all the shapes are circles.