A stadium charges $85 for each seat in section A, $55 for each seat in section B, and $30 for section C. There are three times
as many seats in section B as in section A. The revenue from
selling all 19,600 seats is $770,000.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

a=24; b=12

step-by-step explanation:

a/b=2: 1

a=2b

36/(1+2)=12

b=12

a=24