Question 14
In a group of 55 students, exactly 39 are enrolled in mathematics and exactly 35 are enrolled in science. How many students are enrolled in both mathematics and science?
**Qualification for the checked intended answer:** Assume that all 55 students take at least one of the two subjects. This condition is missing from the original wording. Without it the answer is not unique; the solution gives the full range and a counterexample.
**Qualification for the checked intended answer:** Assume that all 55 students take at least one of the two subjects. This condition is missing from the original wording. Without it the answer is not unique; the solution gives the full range and a counterexample.