Question: If 60% of students play football, 40% play basketball, and 10% play both, what percentage of students play either football or basketball?

Options:

1. 90%
2. 80%
3. 70%
4. 60%

Correct Answer: 90%

Solution:

Using inclusion-exclusion, the percentage of students who play either sport is: 60% + 40% - 10% = 90%.