Step-by-step explanation:
55%

we have the following:
Let the number of solid ticket of cost:
x = upper level
y = center court
z = floor seats

therefore:
All of them except the 3rd one
Answer:
n = 7
Step-by-step explanation:
3(n - 4) = 9
3n - 12 = 9
3n = 9 + 12
3n = 21
n = 21 ÷ 3
n = 7