(b) In another class the students all study at least one language from French, German and Spanish. No student studies all three languages.
The set of students who study German is a proper subset of the set of students who study French.
4 students study both French and German.
12 students study Spanish but not French.
9 students study French but not Spanish.
A total of 16 students study French.
(i) Draw a Venn diagram to represent this information
[4]
(ii) Find the total number of students in this class.

(Cambridge IGCSE Mathematics 0580 Paper 42 09 October/November 2012)