Let the number of hamburgers sold be x. Then the number of cheeseburgers sold is x + 51. The total number of hamburgers and cheeseburgers sold is 701. Therefore, we can set up the equation:
x + (x + 51) = 701
Simplifying the equation:
2x + 51 = 701
Subtract 51 from both sides:
2x = 650
Divide both sides by 2:
x = 325
Therefore, 325 hamburgers were sold on Sunday.
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