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KCC's Quizzes: University Elective Courses

In a university, students might (if they want to) take up to 2 optional foreign language courses: French or Spanish.

1/5 of the students who take French, also take Spanish.

1/7 of the students who take Spanish, also take French.

110 students take only one course.

We assume the two courses are not occurring on the same date.

Question: How many students take both courses?

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