White shapes and black shapes are used in a game.
Some of the shapes are circles.
All the other shapes are squares.
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The ratio of the number of white shapes to the number of black shapes is 6: 13
The ratio of the number of white circles to the number of white squares is 5: 7
The ratio of the number of black circles to the number of black squares is 4: 9
Work out what fraction of all the shanes are circles.
