1) The average of 9 observations was 9, that of the 1st of 5 being 10 and that of the last 5 being 8. What was the 5th observation?

6

7

8

9

2) The average salary per head of the entire staff of an office including the officers and clerks is Rs.90. The average salary of officers is Rs.600 and that of the clerks is Rs.84. If the number of officers is 2, find the number of officers in the office?

840

1540

1020

960

3) The average of first 10 even numbers is?

11

9

18

22

4) Find the average of the first 20 natural numbers?

11.5

10.5

10

12

5) The average age of a husband and a wife is 23 years when they were married five years ago but now the average age of the husband, wife and child is 20 years(the child was born during the interval). What is the present age of the child?

4 year

1 year

2 year

3 year

6) The average marks in mathematics scored by the pupils of a school at the public examination were 39. If four of these pupils who actually scored 5, 12, 15 and 19 marks at the examination had not been sent up, the average marks for the school would have been 44. Find the number of pupils sent up for examination from the school?

25

20

32

30

7) The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.4 the sixth number is?

11.5

11.0

11.3

11.4

8) Nine men went to a hotel. Eight of them spent Rs.3 each over their meals and the ninth spent Rs.2 more than the average expenditure of all the nine. Determine the total money spent by them?

Rs.32

Rs.29.25

Rs.35

Rs.30.25

9) A batsman in his 17th innings makes a score of 85 and their by increasing his average by 3. What is his average after the 17thinnings?

34

35

37

36

10) A team of eight entered for a shooting competition. The best marks man scored 85 points. If he had scored 92 points, the average scores for. The team would have been 84. How many points altogether did the team score?

665

632

656

625

11) Three years ago the average age of a family of six members was 19 years. A boy have been born, the average age of the family is the same today. What is the age of the boy?

2 years

1.5 years

2.5 years

1 year

12) In a hostel there were 100 students. To accommodate 20 more students the average is decreased by rupees 5. But total expenditure increased by Rs.400. Find the total expenditure of the hostel now?

Rs.4600

Rs.2300

Rs.5400

Rs.5000

13) The average of 10 numbers is calculated as 15. It is discovered later on that while calculating the average, one number namely 36 was wrongly read as 26. The correct average is?

18.6

16

12.4

14

14) The average of first 10 prime numbers is?

10

15.5

12.5

12.9

15) The average of first 10 odd numbers is?

10

17

11

9

16) The average temperature for Monday, Tuesday, Wednesday and Thursday was 48 degrees and for Tuesday, Wednesday, Thursday and Friday was 46 degrees. If the temperature on Monday was 42 degrees. Find the temperature on Friday?

38 degrees

34 degrees

36 degrees

40 degrees

17) The average age of M boys is ‘b’ years and of ‘n’ girls ‘c’ years. The average age of all together is?

(mb – nc)/ (m - n) years

(mb + nc)/ (m + n) years

(mb + nc)/ (m - n) years

(mb – nc)/ (m + n) years

18) A building contractor employs 20 male, 15 female and 5 child workers. To a male worker he pays Rs.25 per day, to a female worker Rs.20 per day and a child worker Rs.8 per day. The average wage per day paid by the contractor is?

Rs.21

Rs.20

Rs.23

Rs.22

19) The average salary of workers in an industry is Rs.200 the average salary of technicians being Rs.400 and that of non-technicians being Rs.125. What is the total number of workers?

250

550

275

400

20) The average age 9 members of a committee are the same as it was 2 years ago, because an old number has been replaced by a younger number. Find how much younger is the new member than the old number?

18 years

7 years

27 years

11 years

21) A man purchased 3 blankets @ Rs.100 each, 5 blankets @ Rs.150 each and two blankets at a certain rate which is now slipped off from his memory. But he remembers that the average price of the blankets was Rs.150. Find the unknown rate of two blankets?

Rs.225

Rs.150

Rs.250

None

22) The average age of 8 men increases by 2 years when two women are included in place of two men of ages 20 and 24 years. Find the average age of the women?

24 years

36 years

30 years

18 years

23) The average of first ten prime numbers which are odd is?

13.8

17

15.8

12.9

24) The average age of three boys is 15 years and their ages are in proportion 3:5:7. What is the age in years of the youngest boy?

21

9

15

18

25) The average of five results is 46 and that of the first four is 45. The fifth result is?

10

50

12.5

1

26) The average of 1st 3 of 4 numbers is 16 and of the last 3 are 15. If the sum of the first and the last number is 13. What is the last numbers?

8

2

5

6

27) The average of first 10 natural numbers is?

6

6.5

5

5.5

28) The average weight of 25 persons sitting in a boat had some value. A new person added to them whose weight was 46 kg only. Due to his arrival, the average weight of all the persons decreased by 5 kg. Find the average weight of first 25 persons?

62 kg

None

56 kg

55 kg

29) Visitors to show were charged Rs.15 each on the first day. Rs.7.50 on the second day, Rs.2.50 on the third day and total attendance on the three days were in ratio 2:5:13 respectively. The average charge per person for the whole show is?

Rs.7.50

Rs.5.00

Rs.4.50

Rs.3

30) The average of first five prime numbers greater than 20 is?

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