Question

In a group of 30 high school students, 8 take french, 12 take spanish and 3 take both languages. how many students of the group take neither french nor spanish

Answer 1

8- french
12- spanish
3- both languages ⇒ 8-3=5 only french, 12-3=9 only spanish

30- (5+9+3)=30-17=13 students take neither french nor spanish