A football player runs the ball from the 20-yard line on one side of the field to the 20-yard line on the other side. How many yards did the player run?
To calculate the yards the player ran, we need to find the difference between the starting point and the ending point. The player ran from the 20-yard line on one side of the field to the 20-yard line on the other side, so the total distance covered is 20 yards. Answer: \boxed{20}.
