Tonya is in a hamburger eating contest. Each hamburger is 4 ounces. Last year the winner ate 84 ounces. How many hamburgers does she have to eat to beat last year's winner? Let's think first. Chain of thought:
Last year's winner ate 21 hamburgers because 84 / 4 = 21. She needs to eat 22 hamburgers because 21 + 1 = 22.
Therefore, the answer is 22.