Answer
Darlington has 61,000 seats. Daytona has 159,000 seats.
Work Step by Step
Let x represent the number of seats at Darlington.
2x+37000 represents the number of seats at Daytona.
x+(2x+37000)=220000
3x=183000
x=61000
Darlington has 61,000 seats. Daytona has 159,000 seats.