A group of 80 students were asked what subjects they like and the following results were obtained: 32 students like Mathematics; 29 students like English; 31 students like Filipino; 11 students like Mathematics and Filipino; 9 students like English and Filipino; 7 students like Mathematics and English; and 3 students like the three subjects. a. How many students like Filipino only? b. How many students like English only? c. How many students like Mathematics only? d. How many students do not like any of the three subjects?