Katie collects stamps. She has stamps from Canada, the United States, and the rest of the world in a ratio of 1:1.2:1.5. She has 135 stamps from the rest of the world. a. How many stamps are from Canada?
b. How many stamps are from the United States?
c. What is the total number of stamps in Katie’s collection?

pls explain how you got this!!

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.