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?
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%