Answer:
375 hamburgers and 306 cheeseburgers
Explanation:
Think of it as an equation.
x + x - 69 = 681
2x - 69 = 681
2x = 750
x = 375
Now we know that 375 hamburgers were sold, now we input 375 and find out how many cheeseburgers were sold.
375 + 375 - 69 = 681
375 + 306 = 681
Now we know that 375 hamburgers were sold and 306 cheeseburgers were sold. 306 is 69 fewer than 375, and they add up to 681.