You are on the prom decorationg committee and are in charge of buying balloons. The prom colors are silver and black.
Silver ballons cost $.50 each and Black balloons cost $.10
each. You need 125 balloons and you have $32.50 to spend.
How many of each color should you buy?

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.