Answer:
325 hamburgers were sold on Thursday.
Step-by-step explanation:
Let h be the number of hamburgers and c be the number of cheeseburgers.
Using this information we can set up two equation as:
[tex]h+c=593\\c=h-57[/tex]
Now we need to solve these two equations to get the value of number of hamburgers. For that we use substitution method as shown below:
[tex]h+h-57=593\\2h-57=593\\2h=650\\h=325[/tex]
Therefore, the number of hamburgers sold on Thursday were 325.
