Answer
The students buys the lunch = 157
Step-by-step explanation:
Students buy their lunches in the food court in the university center = 84
Students buy their lunches from a food truck = 101
Students buy their lunches from both = 28
Students buy their lunches either from the food court in the university center or from a food truck = (Students buy their lunches in the food court in the university center) + (Students buy their lunches from a food truck) - (Students buy their lunches from both)
⇒ 84 + 101- 28 = 157
Thus the students buys the lunch = 157