3. Sura, Michael, and Thu were working on the campaign of a local candidate. They prepared 3770 mailings for the re- election push. Sura could prepare 125 mailing per hour, Michael could prepare 120 per hour and Thu could prepare 130 per hour. They worked a total of 30 hours and the sum of Michael's and Thu's hours was twice the number of Sura's hours. How many hours did each worker contribute to the re-election effort? Choose and clearly identify variables: Write a system of equations: ALGEBRAICALLY solve the system, showing work as demonstrated in Lesson 21