In a class of 18 students, 5 are taking German and 11 are taking Spanish. Of the students studying German or Spanish, 4 are taking both courses. How many students are not enrolled in either course?

6

Explanation

The number of students taking German or Spanish is 5 + 11 = 16. Of that group of 16, 4 are taking both languages so they've been counted twice (once in the German group and once in the Spanish group). Subtracting them out leaves 16 - 4 = 12 who are taking at least one language. 18 - 12 = 6 students who are not taking either language.

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