A car drove 200 miles using 10 gallons of fuel. Which operation should be used to compute the miles per gallon?

To compute the miles per gallon, you need to determine how many miles the car traveled for every gallon of fuel it used. This requires taking the total distance traveled, which is 200 miles, and dividing it by the total number of gallons consumed, which is 10 gallons.

The division operation here effectively calculates the rate of miles per gallon by breaking down the total distance into equal parts based on the fuel consumed. Thus, performing the division gives you the miles driven per each gallon of fuel, resulting in 20 miles per gallon. This makes division the correct operation for this calculation.