14129 Marks ***
Hamid has 20 T-shirts.
The information shows the colours of his T-shirts.
7 black
4 dark blue
4 red
1 light blue
2 white
2 grey
Hamid is going to take one of his T-shirts at random.
a) What is the probability that the T-shirt will be grey?
b) What is the probability that the T-shirt will not be red?
c) He takes one of his blue T-shirts at random.
What is the probability that the T-shirt is light blue?

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.