Help please I dont understand this​

If m 17 27 90 63 ** picture is attached

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

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.