Answer:
The number of hamburgers were sold on Thursday is 85
Explanation:
∵ The number of hamburgers is x
∴ the number of cheeseburgers is 2x
∴ x + 2x = 255
∴ 3x = 255
∴ x = 255 ÷ 3 = 85
∴ The number of hamburgers were sold on Thursday is 85
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