An investigator interviewed 100 students to determine their preferences for the three drinks ; milk(M), coffee (C) and tea (T). He reported the following : 10 students had all the three drinks M, C, T; 20 had M and C only; 30 had C and T; 25 had M and T; 12 had M only; 5 had C only; 8 had T only. The number of students that did not take any of the three drinks