A paper company needs to ship paper to a large printing business. The paper will be
shipped in small boxes and large boxes. The volume of each small box is 6 cubic feet
and the volume of each large box is 12 cubic feet. There were twice as many small
boxes shipped as large boxes shipped and the total volume of all boxes was 168 cubic
feet. Write a system of equations that could be used to determine the number of small
boxes shipped and the number of large boxes shipped. Define the variables that you
use to write the system.