The weights of four different insects are given below. insect a: 2.19*10^-4 g; insect b: 5.00*10^-3 g; insect c: 9.0*10^-2 g; insect d: 1.50*10^-3 g what is the order of these insects from heaviest to lightest?

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.