A construction crew is lenghting a road. Let L be the total of the road (in miles). let D be the number of days the crew has worked. Suppose that L=2D+200 give L as a function of D. the crew cab work for at most 60 days.

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.