Part A. Mrs. Alvarez is chaperoning her son’s fifth-grade field trip. She wants to buy an equal number of cookies for each of the four students in her group. Each cookie costs $3. If Mrs. Alvarez has $42, how many cookies can she buy for each student in her group?
a) 2 cookies
b) 3 cookies
c) 4 cookies
d) 5 cookies

Part B. After buying cookies for all four students in her group, how much money does Mrs. Alvarez have left over? Write your answer in the space below.