Question 9
Fifty students take a test with four questions. The numbers of students who correctly answer the questions are given in the following table:
| Question | Number of students |
|---|---|
| Q1 | 48 |
| Q2 | 42 |
| Q3 | 45 |
| Q4 | 15 |
If no student can solve all questions, what is the largest possible number of students who solve both Q3 and Q4 correctly?
| Question | Number of students |
|---|---|
| Q1 | 48 |
| Q2 | 42 |
| Q3 | 45 |
| Q4 | 15 |
If no student can solve all questions, what is the largest possible number of students who solve both Q3 and Q4 correctly?