A company produces fruity drinks that contain a percentage of real fruit juice. Drink A contains 20% real fruit juice and Drink B contains 5% real fruit juice. The company used 56.5 litres of real fruit juice to make 80 more litres of Drink B than of Drink A. Write a system of equations that could be used to determine the number of litres of Drink A made and the number of litres Drink B made. Define the variables that you can use to write the system.