Afruit company delivers its fruit in two types of boxes: large and small. a delivery of 9 large boxes and 7 small boxes has a total weight of 279 kilograms. a delivery of 3 large boxes and 5 small boxes has a total weight of 135 kilograms. how much does each type of box weigh?

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.