Final answer:
To find the number of hamburgers sold on Wednesday, set up an equation using 'x' to represent the number of hamburgers. Simplify the equation and solve for 'x' to get the answer.
Step-by-step explanation:
To find the number of hamburgers sold on Wednesday, we need to set up an equation. Let's say 'x' represents the number of hamburgers. Since there were three times more cheeseburgers sold, the number of cheeseburgers can be represented as '3x'. The total number of hamburgers and cheeseburgers is 540, so we can write the equation as: x + 3x = 540. Simplifying the equation, we get 4x = 540. Dividing both sides by 4, we find that x = 135. Therefore, 135 hamburgers were sold on Wednesday.