What is the sum of the finite arithmetic series? (–5) + 0 + 5 + 10 + ... + 65 A. 900 B. 455 C. 450 D. 445

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.