In the year 2002,the world population was established at 6 billion people. based on research from the world bank, about 20% lived on less than $1 per day. how much people lived on less than $1 per day?

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.