Fiona is gathering signatures on a petition to save the Orangutans. If she gets 4 times the number of signatures that she has right now, she will have at least enough to get a special mention on the Save the Orangutans website, an amazing 8000 signatures. How many signatures has Fiona collected so far? Let "n" be the number of signatures she has now.

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.