Averages

Averages

1. The average monthly salary of 20 employees in an organization is Rs.1500. If the manager’s salary is added, then the average salary increases by Rs.100. What is the manager’s monthly salary?

(1) Rs: 3,500 (2) Rs: 3,600 (3) Rs: 3,800 (4) Rs: 3,900

2. The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 81 and the dullest 25% a mean score of 31. The mean score of remaining 55 is?

(1) 45 (2) 50 (3) 51 (4) 54

3. A batsman makes a score of 64 runs in the 16^th innings and thus increased his average by 3. Find his average after the 16^th inning

(1) 18 (2) 17 (3) 19 (4) 16

4. Twelve years ago, the average age of a husband and his wife was 20years. The average is same today, when they have two children. What is the present age of the youngest child if they differ in age by 2years?

(1) 6years (2) 5years (3) 8years (4) 7years

5. The average age of Jawans in Army of 40 is reduced by 1 year, when 10 men whose average age is 20 years are discharged and 10 new men are admitted. Find the average age of new group joined the army?

(1) 14 (2) 15 (3) 16 (4) 17

6. The average weight of 8 men is increased by 2kgs when one of the men whose weight 50kgs is replaced by a new man. Find the weight of the new man?

(1) 60kgs. (2) 65kgs. (3) 63kgs. (4) 66kgs.

7. I went to a hotel along with twelve friends. I paid Rs: 145 and all the others paid an equal amount. In the end, we did some calculations and found that the average sum paid by all of us was Rs: 5 more than what was originally paid by each of my friends. How much money did each of my friends pay?

1. Rs: 120 (2) Rs: 100 (3) Rs: 80 (4) Rs: 70

8. What is the average of odd numbers from 1 to 40?

1.40 2.25 3.20 4.30

9. Find the average of first 31 consecutive even numbers?

1. 30 2.31 3.32 4.none of these

10. A man walks 1 km at 15 km per hour and another 1 km he walks at 5 km per hour. Find his average speed for the whole distance in covering 2 km.

1.5 km/hr 2.6.2 km/hr 3.7.5 km/hr 4.8.4 km/hr

11. The average of 10 numbers is 7. What will be the new average if each of the numbers is multiplied by 8?

1. 45 2.52 3.55 4.56

12.The average weight of 5 persons sitting in a boat is 38 kg. If the average weight of the boat and the persons sitting in the boat is 52 kg. What is the weight of the boat?

1. 228 kg 2.122 kg 3.232 kg 4.242 kg

13. The average weight of 24 students of section A of a class is 58 kg whereas the average weight of 26 students of section B is 60.5 kg. Find the average weight of all the 50 students of class.

1. 57.4 kg 2.59.3 kg 3.58.9 kg 4.59.7 kg

14. The average age of 5 members is 21 years. If the age of the youngest member is 5 years, find the average age of the family at the birth of the youngest member.

1.24 years 2.25 years 3.20 years 4.28 years

15. The average of 7 numbers is 5. If the average of first six of these numbers is 4, the seventh number is

1. 14 2.12 3.11 4.15

16. The average weight of 10 students is increased by half a kg when one of the students weighing 50 kg is replaced by a new student. Find the weight of the new student.

1. 55 kg 2.60 kg 3.45 kg 4.40 kg

17. The average income of A for 15 days is Rs.70. The average for the first 5 days is Rs.60 and that for the last 9 days is Rs.80. The income for the sixth day is:

1. Rs.80 2.Rs.60 3.Rs.40 4.Rs.30

18. The average of 17 numbers is 10.9. If the average of first nine numbers is 10.5 and that of the last 9 numbers is 11.4. Find the middle number

1. 11.8 2.11.4 3.10.9 4.11.7

19. The sum of three numbers is 98. If the ratio between first and second be 2:3 and that between second and third be 5:8, then the second number is:

1. 30 2.20 3.58 4.48

20. It rained as much on Wednesday as on all the other days of week combined. If the average rainfall for the whole week was 3 cm, how much did it rain on Wednesday?

1. 2.625 cm 2.3 cm 3.10.5 cm 4.15 cm

21. The average age of 20 boys in the class is 15.6 years. Five new boys join and the new average becomes 15.56 years. What was the average age of five new boys?

1. 15.5 2.15.4 3.15.25 4.15.3

22. In a class, there are 20 boys whose average age is decreased by 2 months, when one boy aged 18 years is replaced by a new boy. The age of the new boy is.

1. 14 yrs 8 months2.15 yrs 3.16 yrs 4 months 4.17 yrs 10 months

23. The average daily wages of A, B and C is Rs.120. If B earns Rs.40 more than C per day and A earns double of what C earns per day, the wages of A per day is

1. Rs.80 2.Rs.120 3.Rs.160 4.Rs.100

24. With an average speed of 40 km/hr a train reaches its destination on time. If it goes with an average speed of 35 km/hr it is late by 15 minutes. The total journey is:

1.30 km 2.40 km 3.70 km 4.80 km

25. The mean daily profit made by shopkeeper in the month of 30 days was Rs.350. If the mean profit for the first 15 days were Rs.275, the mean profit for the last 15 days would be

1. Rs.200 2.Rs.2753 3.Rs.350 4.Rs.425

26. A man whose bowling average is 12.4 takes 5 wickets for 26 runs and thereby decreases his average by 0.4. The number of wickets taken by him before his last match is:

1. 85 2.78 3.72 4.64

27. There were 35 students in a hostel. If the number of students increases by 7, the expenses of the mess increase by Rs.42 per day while the average expenditure per head reduces by Rs.1. Find the original expenditure of the mess.

1. Rs.480 2.Rs.420 3.Rs.520 4.Rs.460