Respuesta :
Answer:
Hello!!! Princess Sakura here ^^
Step-by-step explanation:
If the lower level has 100 less than 2 times as many seats as the upper level then the expression is 2x-100 and the middle level has 80 more than 3 times as many seats as the upper level so it's 3x+80 and lastly the top level is just x.
so now for the equation you would add all those expressions and they all should equal 2680:
[tex]x+3x+80+2x-100=2680\\6x-20=2680\\6x=2700\\x=450[/tex]
but now don't forget to plug in for the middle level:
[tex]3x+80\\3(450)+80\\1350+80\\1430[/tex]
Therefore the middle level has 1430 seats.