The number of bacteria in a culture increases at a rate proportional to the number of bacteria present. If the number of bacteria was 600 after 3 hours and 19200 after 8 hours, when will the population reach 120000?

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.