Answer: 105 hamburgers were sold on Saturday.
Step-by-step explanation:
Let x represent the number of hamburgers that were sold on Saturday.
Let y represent the number of cheeseburgers that were sold on Saturday.
On Saturday, the local hamburger shop sold a combined total of 315 hamburgers and cheeseburgers. This means that
x + y = 315- - - - - - - - - -1
The number of cheeseburgers sold was two times the number of hamburgers sold. This means that
y = 2x
Substituting y = 2x into equation 1, it becomes
2x + x = 315
3x = 315
x = 315/3
x = 105
