There are 80 people at the city swim park today. Everyone in the park was wearing swim suits or sunglasses, some people had both. How many people had swim suits on but not sunglasses, if you know 68 people have swim suits on and 39 have sunglasses?

41

Step-by-step explanation:

The total number of people present (80) includes those that were wearing sunglasses (39) and those who were not (80-39 = 41). Since there were no people present wearing neither glasses nor suits, the number wearing suits but not glasses was 41.