Five years ago awuni's father was 3 times as old as his son anaba, in fifteen years time awuni's father will be twice as old as his son anaba, what is the difference between their ages? ​

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.