In a class of 30 students, 15 students can speak Marathi, 17 can speak Hindi, and 13 can speak English. 5 students can speak both English and Marathi, and 2 of them can speak Hindi also. 6 students speak only English and 7 students speak only Hindi. How many students speak only Marathi?

Among 100 people, 40 people like tea, 58 people like coffee, and 26 people like both tea and coffee. Find the number of persons who like neither tea nor coffee.

In an examination of 500 candidates comprising tests in English, Hindi, and Mathematics, the failure counts in individual and combined subjects are given as follows: - Failed in English and Hindi only = 9 - Failed in English and Mathematics only = 12 - Failed in Hindi and Mathematics only = 13 - Failed in all three subjects = 5 What is the percentage of candidates who failed in at least two subjects?