If c+d=40 and 10 ≤ c ≤ 30, all of the following are possible values of d EXCEPT, A. 7
B. 14
C. 21
D. 28

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.