Sean has a collection of coins. one tenth of the coins are from europe. thirty-two hundredth are from asia. the rest are from africa. write a decimal to show the total part of the coins that are from europe or asia.

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.