In a class of 200 students, 120 students take German, and 100 study French. If a student must study at least one of these languages, what percent of the students study French but not German?

40%

Explanation

First thing is that we know that 20 students are taking both French and Spanish. So we have to take 20 away from 100.
100-20 = 80
Percent of the students study French but NOT Spanish = (80/100)*100% = 40%

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