The triangles below are similar find the value of i’m stuck

Hello i need some with trigonometric substitutions. [tex]\int\limits^a_b {x} \, dx[/tex]

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest 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 cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.

Im so bad at fractions they are not my best math thing to work on