Charlotte works at an art gallery where she earns 20 commission and $15 per hour. If she works for 8 hours and sells $400 worth of art work, how much will she earn in total?

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.