for the high school’s production of "grease," 315 tickets were sold. the cost of a student ticket, s, was $5; the cost of all other tickets, t, was $8. the total income from ticket sales equaled $2211. the system of equations below can be used to determine the number of each type of ticket sold.

Case # 51173878 weighs 814 pounds; case # 51173981 weighs 803 pounds; case # 51174058 weighs 817 pounds; case 51174178 weighs 815 pounds; case # 51174248 weighs 817 pounds; case # 51174495 weighs 781 pounds; case # 51174577 weighs 828 pounds. what are the case #'s of the two cases that weigh the same amount?