On Friday, a local hamburger shop sold a combined total of 318 hamburgers and cheeseburgers. The number of cheeseburgers sold was two times the number of hamburgers sold. How many hamburgers were sold on Friday?
Let H be the number of hamburgers sold.
The number of cheeseburgers sold is 2H.
The combined total is H + 2H = 318 hamburgers.
Combining like terms, we get 3H = 318.
Dividing both sides by 3, we get H = 106 hamburgers. Answer: \boxed{106}.