एक कक्षा में, 20 छात्र पढ़ना पसंद करते हैं, 15 चित्रकारी पसंद करते हैं, और 10 दोनों पसंद करते हैं। कितने छात्र केवल पढ़ना पसंद करते हैं?

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?