Average Worksheet-2

Average Worksheet-2

1. The average of a non–zero number and its square is 5 times the number. The number is:

(a) 9                    (b) 17                  (c) 29                  (d) 295

2. The average of 7 consecutive numbers is 20. The largest of these numbers is:

(a) 20                 (b) 22                 (c) 23                  (d) 24

3. The average of five consecutive odd numbers is 61. What is the difference between the highest and lowest numbers?

(a) 2                                                 (b) 5

(c) 8                                                 (d) Cannot be determined

(e) None of these

4. The sum of three consecutive odd numbers is 38 more than the average of these numbers. What is the first of these numbers?

(a) 13                                               (b) 17

(c) 19                                               (d) Data inadequate

(e) None of these

5. The average age of the boys in a class is 16 years and that of the girls is 15 years. The average age for the whole class is:

(a) 15 years

(b) 15.5 years

(c) 16 years

(d) Cannot be computed with the given information

6. The average annual income (in Rs.) of certain agricultural workers is S and that of other workers is T. The number of agricultural workers is 11 times that of other workers. Then the average monthly income (in Rs.) of all the workers is:

(a)             (b)         (c)         (d)

7. A family consists of grandparents, parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family?

(a) years                               (b) years

(c) years                                (d) None of these

8. A library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is :

(a) 250               (b) 276               (c) 280               (d) 285

9. If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55 and 60, then the average marks of all the students is:

(a) 53.33            (b) 54.68           (c) 55                  (d) None of these

10. The average weight of 16 boys in a class is 50.25 kgs and that of the remaining 8 boys is 45.15 kgs. Find the average weight of all the boys in the class.

(a) 47.55 kgs     (b) 48 kgs          (c) 48.55 kgs     (d) 49.25 kgs

11. A car owner buys petrol at Rs 7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Rs. 4000 each year?

(a) Rs. 7.98       (b) Rs. 8             (c) Rs. 8.50       (d) Rs. 9

12. The average of six numbers is x and the average of three of these is y. If the average of the remaining three is z, then:

(a) x = y + z                                    (b) 2x = y + z

(c) x = 2y + 2z                               (d) None of these

13. Out of 9 persons, 8 persons spent Rs. 30 each for their meals. The ninth one spent Rs. 20 more than the average expenditure of all the nine. The total money spent by all of them was:

(a) Rs. 260        (b) Rs. 290        (c) Rs. 292.50  (d) Rs. 400.50

14. The average of 50 numbers is 30. If two numbers, 35 and 40 are discarded, then the average of the remaining numbers is nearly:

(a) 28.32           (b) 28.78           (c) 29.27            (d) 29.68

15. The average of five numbers is 27.If one number is excluded, the average becomes 25. The excluded number is:

(a) 25                  (b) 27                  (c) 30                  (d) 35

Answer Key:

(1)-a; (2)-c; (3)-c; (4)-b; (5)-d; (6)-d; (7)-b; (8)-d; (9)-b; (10)-c; (11)-a; (12)-b; (13)-c; (14)-d; (15)-d