Final answer:
The correct equation is t = { r / 220 }.
Step-by-step explanation:
The correct equation for the given verbal sentence is:
t = { r / 220 }
This equation represents the ticket price, t, for a concert attended by 220 people, which is equal to the total revenue, r, divided by the number of people who attended. In this equation, the division symbol ( / ) indicates the division operation, and 220 is the divisor. Therefore, option a. t = { r / 220 } is the correct equation.