Let's denote: x = number of hamburgers sold x + 67 = number of cheeseburgers soldSince the total number of hamburgers and cheeseburgers sold is 817, we can write the equation:x + (x + 67) = 817Combine like terms: 2x + 67 = 817Subtract 67 from both sides: 2x = 817 - 67 2x = 750Divide both sides by 2: x = 750 / 2 x = 375So, 375 hamburgers were sold on Thursday.
