Can someone explain how to compute this problem?

The following 3 questions (04 to Q6) are based on the information below: A local sports bar wanted to determine whether Ohio University students prefer a particular type of food in their establishment. A sample of 100 students responses are reproduced below. Do students prefer a particular type of bar food? Use critical value = 7.82. Natchos Pizza Chicken Wings Cheese Sticks 18 22 20 40 Q4: What are the expected values? Q5: What is the calculated chi-squared value? Q6: Was there a significant preference for what students eat in a sports bar? A. Yes B. No