The number of hours it takes to assemble machines varies inversely as the number of people putting them together but directly as the number of machines that need to be built. If four men can build 12 machines in
four hours, how man men are needed to assemble 36 machines in 8 hours?
(plz help with no links and show ur wrk!!) due by 9:00

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.