Atheater holds 2,680 seats. the lower level has 100 less than 2 times as many seats as the upper level. the middle level has 80 more than 3 times as many seats as the upper level. how many seats are in the middle level?

Assign variables to make things easier:
a = Upper
b = Middle
c = Lower
Equations:
c = 2a-100
b = 3a+80
a = a
(2a-100)+(3a+80)+(a) = 2680
6a-20 = 2680
6a = 2700
a = 450
Now plug a into the middle equation:
b= 3a+80
b = 3(450)+80
b = 1350+80
b = 1430
The middle level has 1430 seats.
You can check this by solving for the upper level and checking all 3 levels equal 2680.
c = 2a-100
(skipping steps)
c=800
Totals:
a = Upper = 450
b = Middle = 1430
c = Lower = 800
Total: 2680

Letter b sorry i’m i’m wrong xx

If i'm correct the answer is $15.97