Afood packaging company makes a popular fruit cocktail. to ensure a good mixture of fruit, there are 3 cherry halves for every white grapes in a jar. an inspector notices that one jar has 12 cherry halbes and 20 white grapes. what can be done to fix the error

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.