Molly and arthur are taking their daughter ginny on a roller coaster ride. for safety, they need to find their total weight before getting into the same car. molly's weight is mmm kilograms, arthur's weight is aaa kilograms, and ginny's weight is ggg kilograms.

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.