1.The average of nine numbers is 17. The average of first four numbers is 14 and the average of last four numbers is 19. What is the middle number? (2)
1) 15 2) 21 3) 17 4) Can’t be determined 5) None of these
2.In a class, the average age of 30 boys is 13 years and the average age of 20 girls is 12 years. What is the average age of the whole class? (4)
1) 12.5yrs 2) 14.2yrs 3) 12.3yrs 4) 12.6yrs 5) None of these
3. There are two sections A and B of a class, consisting of 36 and 44 students’ respectively. If the average weight of section A is 40 kg and that of section B is 35 kg, find the average weight of the whole class. (2)
1) 39.6kg 2) 37.25kg 3) 37.5kg 4) 36.75kg 5) None of these
4. A student obtained 76, 65, 82, 67 and 85 marks (out of 100) in English, mathematic physics, chemistry and biology. What are his average marks? (3)
1) 72 2) 79 3) 75 4) 69 5) None of these
5. The average age of a class of 24 students is 11 years. If the teacher’s age is also included, the average increases by one year. Find the age of the teacher. (4)
1) 35 2) 39 3) 34 4) 36 5) None of these
