A publisher needs to send many books to local book realtor and will send the books in a combination of small and large boxes. Each put small box can hold 30 books and he's large box can hold 55 for books. A total of 10 boxes with sent which can hold 375 books altogether. 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.