Answer: Let's call the number of hamburgers sold "x". Then the number of cheeseburgers sold would be x + 53. The total number of hamburgers and cheeseburgers sold is 553, so we can set up the equation:
x + (x + 53) = 553
Expanding the left side:
2x + 53 = 553
Subtracting 53 from both sides:
2x = 500
Finally, dividing both sides by 2:
x = 250
So on Wednesday, 250 hamburgers were sold.
Explanation: