Markus receives the same amount of money from his grandfather for one week. After the first day he received $5. After the second day
he had received $10 total, and after the third day he had $15. If this
continues, how much money will Markus have by the end of the 7 day
week?

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.