Answer:
Sam sold 14 tickets
Explanation:
Let s represent the number of tickets Sam sold. Then the number Chad sold was (24-s) and the total revenue was ...
2s +5.50(24-s) = 83
-3.50s + 132 = 83 . . . . simplify
-3.50s = -49 . . . . . . . . .subtract 132
s = -49/-3.50 = 14 . . . . divide by the coefficient of s
Sam sold 14 tickets.