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.