Katie collects stamps. she has stamps from canada, the u. s.a, 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 u. s.a?
c) what is the total number of stamps in katie's collection?

( explain and show how you got those answers.)

Mrs. julien’s and mrs. castillejo’s classes are selling cookie dough for a school fundraiser. customers can buy packages of macadamia nut chip cookie dough and packages of triple chocolate cookie dough. mrs. julien’s class sold 25 packages of macadamia nut chip cookie dough and 30 packages of triple chocolate cookie dough for a total of $221.25. mrs. castillejo’s class sold 5 packages of macadamia nut chip cookie dough and 45 packages of triple chocolate cookie dough for a total of $191.25. (a) write the system of equations that model the problem. be sure to explain which equation represents which situation. (b) find the cost of each type of cookie. show your work. (c) explain which method you used to solve the system and why you chose that method.