Question 29976
r = # reserved seats sold
u = # unreserved seats sold
r + u = 1096
(25 x r) + (20 x u) = 26170
substitute
r = 1096 - u
(25 x (1096 - u)) + (20 x u) = 26170
27400 - 25u + 20u = 26170
-5u = 26170 - 27400
-5u = -1230
u = 246
r = 1096 - u
r = 850
check
(25 x 850) + (20 x 246) = 26170
21250 + 4920 = 26170
26170 = 26170
OK