Mario is arranging unit cubes. He stacks all of the cubes to make a solid figure with no gaps. What is the volume of the figure Mario creates?

a.9 units cube

b.10 units cubed

c.6 units cubed

d.4 units cubed

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.