A publisher needs to send many books to a local book retailer and will send the books
in a combination of small and large boxes. Each small box can hold 20 books and
each large box can hold 45 books. There were twice as many large boxes sent as small
boxes, which altogether can hold 440 books. Write a system of equations that could
be used to determine the number of small boxes sent and the number of large boxes
sent. Define the variables that you use to write the system.