Jared randomly surveyed some students to determine there lunch habits . 15 students out of 50 said they bring their lunch to school. if there are 460 students in the school predict how many do not bring their lunch from home

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.