Average Questions and Answers

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Aptitude Model Questions on Average

1. The average of five numbers is 49. The average of the first and the second numbers is 48 and the average of the fourth and filth numbers is 28. What is the third number?
A. 92
B. 91
C. 95
D. Cannot be determined
E. None of these

2. A student was asked to find the arithmetic mean of the following 12 numbers: 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 and x He found the mean to be 12. The value of x will be :
A. 3
B. 7
C. 17
D. 31

3. A cricket batsman had a certain average of runs for his 11 innings. In the 12th innings, he made a score of 90 runs and thereby his average of runs was decreased by 5. His average of runs after 12th innings is :
A. 155
B. 150
C. 145
D. 140

4. The average age of mother and her six children is 12 years, which is reduced by 5 years if the age of the mother is excluded. The age of the mother (in years) is :
A. 50
B. 40
C. 48
D. 42

5. The average monthly salary of all the employees in an industry is 12,000. The average salary of male employees is 15,000 and that of female employees is 8,000. What is the ratio of male employees to female employees?
A. 5:2
B. 3:4
C. 4:3
D. 2:5

6. A man spends 1800 monthly on an average for the first four months and 2000 monthly for the next eight months and saves 5600 a year. His average monthly income is
A. 2000
B. 2200
C. 2400
D. 2600

7. The average of five num hers is 57.8. The average of the first and the second numbers is 77.5 and the average of the fourth and fifth numbers is 46. What is the third number?
A. 45
B. 43
C. 42
D. Cannot be determined
E. None of these

8. The average speed of a bus is 8 times the average speed of a bike. The bike covers a distance of 186 km in 3 hours. How much distance will the bus cover in 10 hours?
A. 4069km
B. 4096km
C. 4960km
D. 4690km
E. None of these

9. Find the average of the following set of scores-
125, 236, 334, 486, 564, 625, 702, 800
A. 448
B. 482
C. 624
D. 542
E. None of these

10. The average height of four girls was recorded as 150 cm. If the average of the heights of three girls out of the four was 148 cm, what was the height of the fourth girl?
A. 156cm
B. 168cm
C. 170cm
D. 162cm
E. None of these

11. There are 50 students in a class. Their average weight is 45 kg. When one student leaves the class the average weight reduces by 100g. What is the weight of the student who left the class ?
A. 45 kg
B. 47.9 kg
C. 49.9 kg
D. 50.1kg

12. If the difference between the average of x, y and y, z is 12, then the difference between x and z is :
A. 24
B. 48
C. 12
D. 6

13. Of three numbers, the first is 4 times the second and 3 times the third. If the average of all the three numbers is 95, what is the third number?
A. 76
B. 60
C. 130
D. 57
14. In a family, the average age of a father and a mother is 35 years. The average age of the father, mother and their only son is 27 years. What is the age of the son?
A. 12 years
B. 11 years
C. 10.5 years
D. 10 years

15. The average of odd numbers upto 100 is
A. 50.5
B. 50
C. 49.5
D. 49

16. The mean of50 numbers is 30. Later it was discovered that two entries were wrongly entered as 82 and 13 instead of28 and 31. Find the correct mean.
A. 36.12
B. 30.66
C. 29.28
D. 38.21

17. The average of three consecutive odd numbers is 12 more than one third of the first of these numbers. What is the last of the three numbers?
A. 15
B. 17
C. 19
D. Data inadequate

18. The average of 18 observations is recorded as 124. Later it was found that two observations with values 64 and 28 were entered wrongly as 46 and 82. Find the correct average of the 18 observations.
A. 111%
B. 122%
C. 123%
D. 132%

19. The average age of four boys, five years ago was 9 years. On including a new boy, the present average age of all the five is 15 years. The present age of the new boy is
A. 14 years
B. 6 years
C. 15 years
D. 19 years

20. If the average of 39, 48, 51, 63, 75, 83, x and 69 is 60, then the value of x is
A. 52
B. 53
C. 50
D. 51

21. The average age of group of 20 girls is 15 years and that of another group of 25 boys it is 24 years. The average age of the two groups mixed together is
A. 19.5 years
B. 20 years
C. 21 years
D. 21.5 years

22. In a team of 10 persons, nine persons spent 40 each for their meal and the remaining one spent 9 more than the average expenditure of all the 10 persons. The total expenditure for their meal was
A. 510
B. 310
C. 410
D. 610

23. The average of four consecutive even numbers A, B, C and D is 37. What is the product of A & C? A. 1521
A. 1368
B. 1292
C. 1224
D. None of these

24. Find the missing number if the average of all the eight numbers is 474.
533, 128, 429, 225, _, 305, 601, S04
A. 76
B. 781
C. 776
D. 758
E. None of these

25. Sushil scared 103 marks in Hindi, 111 marks in Science, 98 marks in Sanskrit, ll0 marks in Maths and 88 marks in English. If the maximum marks of each subject are equal and if Sushil scored 85 percent marks in all the subjects together, find the maximum marks of each subject.
A. 110
B. 120
C. 115
D. 100
E. None of these

26. The average temperature of Monday, Tuesday and Wednesday was 30°C and that of Tuesday, Wednesday and Thursday was 33°C. If the temperature on Monday was 32°C, then the temperature on Thursday was:
A. 33°C
B. 30°C
C. 41°C
D. 32°C

27. The average age of a jury of 5 is 40. If a member aged 35 resigns and a man aged 25 becomes a member, then the average age of the new jury is
A. 30
B. 38
C. 40
D. 42

28. The average height of 21 girls was recorded as 148 cm. when the teacher’s height was included, the average of their hights increased by 1 cm. What was the height of the teacher?
A. 156cm
B. 168cm
C. 170cm
D. 162cm
E. None of these

29. The average of four consecutive odd numbers A, B, C and D respectively is 40. What is the product of B and D?
A. 1599
B. 1591
C. 1763
D. 1677
E. None of these

30. The average weight of 21 boys was recorded as 64 kg. If the weight of the teacher was added, the average increased by one kg. What was the teacher’s weight?
A. 86 kg
B. 64kg
C. 72kg
D. 98 kg
E. None of these

31. Find the average of the following set of scores.
253, 124, 255, 534, 836, 375, 101, 443, 760
A. 427
B. 413
C. 441
D. 490
E. None of these