Tanvi is starting a science experiment. She will grow salt crystals in a clear plastic box. The inside of Tanvi's box is 9 inches long and 5 inches wide. Tanvi pours salt water into the box to a height of 4 inches. What is the volume of salt water in the box?

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.