To help plan number of meals to be prepared in the college cafeteria, the survey was performed, and following data were obtained.
131 students ate breakfast.
179 students ate lunch.
270 students ate dinner.
60 students ate breakfast and lunch.
115 students ate breakfast and dinner.
85 students ate lunch and dinner.
50 students ate all three meals.
How many students ate
(i) At least one meal in the cafeteria?
(ii) Exactly one meal in the cafeteria?
(iii) Only dinner in the cafeteria?
(iv) Exactly two meals in the cafeteria?