Answer:
So there's a hamburger shop that sold a total of 769 hamburgers and cheeseburgers on Friday. Apparently, there were 69 more cheeseburgers sold than hamburgers.
Now, the question is: how many hamburgers were sold on Friday?
Let's break it down. Let's call the number of hamburgers sold "h" and the number of cheeseburgers sold "c". We know that:
h + c = 769
And we also know that:
c = h + 69
We can use the second equation to substitute "c" in the first equation:
h + (h + 69) = 769
Simplifying this equation, we get:
2h + 69 = 769
Subtracting 69 from both sides:
2h = 700
Dividing both sides by 2:
h = 350
So it looks like 350 hamburgers were sold on Friday!