1.
The average age of 30 students is 9 years. If the age of their teacher is included, it becomes 10 years. The age of the teacher (in years) is
2.
The average weight of 10 men is decreased by 3 kg when one of them whose weight is 80 kg is replaced by a new person. The weight of the new person is
3.
The average of 17 numbers is 45. The average of first 9 of these numbers is 51 and the last 9 of these numbers is 36. What is the ninth number?
4.
The average weight of 9 mangoes increases by 20 gm if one of them weighing 120 gm is replaced by another. The weight of the new mango is
5.
The average age of boys in the class is twice the number of girls in the class. If the ratio of boys and girls in the class of 36 be 5 : 1. What is the total of the ages (in years) of the boys in the class?
6.
The average weight of a class of 24 students is 35 kg. if the weight of the teacher be included, the average rises by 400 g. The weight of the teacher is
7.
The average marks in Science subject of a class of 20 students is 68. If the marks of two students were misread as 48 and 65 instead of the actual marks 72 and 61 respectively, what would be the correct average?
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
9.
The average sale of a car dealership was 15 cars per week. After a promotional scheme the average sale increased to 21 cars per week. The percentage increase in the sale of cars was
10.
The average of the first five multiple of 3 is
11.
In a school, average weight of 15 teachers was calculated as 58 kg. But later it was found that a teacher whose actual weight was 87 kg wrongly taken as 78 kg. Actual average was
12.
Three years ago the average age of a family of 5 members was 17 years. A baby having been born, the average age of the family is the same today. The present age of the baby is
13.
In the first 10 overs of a cricket game, the run rate was only 3.2. What should be the run rate in the remaining 40 overs to reach the target of 282 runs?
14.
The average marks obtained by 22 candidates in an examination are 45. The average marks of the first ten are 55 and that of the last eleven are 40. The number of marks obtained by the 11th candidate is
15.
In a family, the average age of 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?
16.
The arithmetic mean of 15 numbers is 41.4. Them the sum of these numbers is
17.
Five years ago, the average age of P and Q was 15 years. Average age of P, Q and R today is 20 years. How old will R be after 10 years?
18.
The average age of 25 boys in a class is 16 years. If the age of two teachers was added, the average increases by one. What is the sum of the ages of the two teachers?
19.
The average of Rohan’s marks in 7 subjects is 75. Her average in six subjects excluding science is 72. How many marks did she get in science?
20.
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.
21.
The average age of 24 boys and the teacher is 15 years. When the teacher’s age is excluded the average decreases by 1. What is the age of the teacher?
22.
The average age of seven boys sitting in a row facing North is 26 years. If the average age of the first three boys is 19 years and the average age of the last three boys is 32 years, what is the age of the boy who is sitting in the middle of the row?
23.
The average age of the mother and her six children is 12 years which is reduced by 5 years if the age of the mother is excluded. How old is the mother?
24.
A batch of 60 students made an average score of 50 marks and another batch of 40 students made it only 45. What is the overall average score?
25.
The average of eight numbers is 14. The average of six of these numbers is 16. The average of the remaining two numbers is
26.
The average weight of 6 men decreases by 3 kg when one of them weighing 80 kg is replaced by a new man. The weight of the new man is
27.
Kunal bought 65 books for Rs.1050 from one shop and 50 books for Rs.1020 from another. What is the average price he paid per book?
28.
Average age of ten persons learning yoga is 32 years. When the age of their instructor is added, the average age becomes 34 years. The age of their instructor is
29.
The average of 11 numbers is 10.9. If the average of the first six numbers s 10.5 and that of the last six numbers is 11.4, then the middle number is
30.
The average age of a committee of eight members is 40 years. A member aged 55 years retired and his place was taken by another member aged 39 years. The average age of the present committee is
31.
Mean of eight numbers is 38.4 and the mean of seven of them is 39.2. What is the eight number?
32.
In seven given numbers, the average of first four numbers is 4 and that of the last four numbers is also 4. If the average of these seven numbers is 3, the fourth number is
33.
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
34.
The average of five numbers is 306.4. The average of the first two numbers is 431 and the average of the last two numbers is 2145. What is the third number?
35.
The average monthly income of a family of four earning members was Rs.15130. One of the daughters in the family got married and left home, so the average monthly income of the family came down to Rs.14660. What is the monthly income of the married daughter?
36.
A family consists of grandparents, parents and three grand children. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grand children is 6 years. What is the average age of the family?
37.
The average age of husband, wife and their child 3 years ago was 27 years and that of wife and the child 5 years ago was 20 years. The present age of the husband is
38.
A shop of electronic goods is closed on Monday. The average daily sales for remaining six days of a week is Rs.15,640 and the average sale on Tuesday to Saturday is Rs.14,124. The sales on Sunday is
39.
The average monthly expenditure of a family was Rs. 2200 during the first 3 months, Rs. 2250 during the next 4 months and Rs. 3120 during the last 5 months of a year. If the total savings during the year were Rs. 1260, find the average monthly income of the family.
40.
The average of 10 numbers is 40.2 . Later it is found that two numbers have been wrongly added. The first is 18 greater than the actual number and the second number added is 13 instead of 33. Find the correct average.
41.
The mean high temperature of the first four days of a week is 25°C whereas the mean of the last four days is 25.5°C. If the mean of the whole week is 25.2°C, then the temperature of the 4th day is
42.
13 chairs and 5 tables were bought for Rs. 8280. If the average cost of a table be Rs. 1227, what is the average cost of a chair?
43.
The average age of an adult class is 40 years. 12 new students with an average age of 32 years join the class, thereby decreasing the average by 4 years. The original strength of the class was
44.
Distance between two stations A and B is 778 km. A train covers the journey from A to B at 84 km per hour and returns back to A with a uniform speed of 56 km per hour. Find the average speed of the train during the whole journey.
45.
The average weight of 24 students in section A of a class is 58 kg, whereas the average weight of 26 students in section B of the same class is 60.5 Kg. Find out the average weight of all the 50 students of the class.
46.
The average income of A for 15 days is Rs. 70. The average for first five days is Rs. 60 and that for the last nine days is Rs. 80. A’s income for the sixth day is
47.
David obtained 76, 65, 82, 67 and 85 marks (out of 100) in English, Mathematics, Physics, Chemistry and Biology. What is his average mark?
48.
The average of the boys in a class is 16 years and that of girls is 15 years. The average age for the whole class is
49.
The average of five numbers is 27. If one number is excluded, the average becomes 25. The excluded number is
50.
A batsman in his 17th innings, makes a score of 85 runs, and thereby, increases his average by 3 runs. What is his average after the 17th innings? He had never been ‘not out’.
51.
The average temperature from Monday to Thursday is 48°C and from Tuesday to Friday is 52°C. If the temperature on Monday is 42°C. What was it on Friday?
52.
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
53.
The average age of 35 students in a class is 16 years. The average age of 21 students is 14. What is the average age of remaining 14 students?
54.
The average salary of 20 workers in an office is Rs. 1900 per month. If the manager’s salary is added, the average becomes Rs. 2000 per month. The manager’s salary (in Rs) is
55.
A man purchased 5 toys at Rs.200 each, 6 toys at Rs.250 each and 9 toys at Rs.300 each. Calculate the average cost of 1 toy.
56.
What is the average of even numbers from 1 to 81?
57.
A man goes to a certain place at a speed of 30 km/h and returns to the original place at a speed of 20 km/h, find out his average speed during this up and down journey.
58.
The sum of five numbers is 555. The average of the first two numbers is 75 and the third number is 115, what is the average of the last two numbers?
59.
Kamlesh bouth 65 books for Rs.1.050 from one shop and 50 books for Rs.1.020 from another. What is the average price he paid per book?
60.
Average age of seven persons in a group is 30 years. The average age of five persons of this group is 31 years. What is the average age of the other two persons in the group?
61.
The average of six numbers is 20. If one number is removed, the average becomes 15. What is the number removed?
62.
Ten years ago the average age of P and Q was 20 years. Average age of P, Q and R is 30 years now. After 10 years, the age of R will be
63.
The sum of five numbers is 260. The average of the first two numbers is 30 and the average of the last two numbers is 70. What is the third number?
64.
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, the middle number is
65.
The average age of A, B and C is 26 years, if the average age of A and C is 29 years, what is the age of B in years?
66.
In a school, the average age of students is 6 years, and the average age of 12 teachers is 40 years. If the average age of the combined group of all the teachers and the students is 7 years, then the number of students is
67.
The average age of A and B is 20 years, that of B and C is 19 years and that of A and C is 21 years. What is the age (in years) of B?
68.
The cost of 5 kg of apples is Rs.450. the cost of 12 dozen mangoes is Rs.4320, and the cost of 4 kg of oranges is Rs.240. What is the total cost of 8 kg of apples, 8 dozens of mangoes and 8 kg of oranges?
69.
The mean of 100 items was 46. Later on it was discovered than an item 116 was misread as 61 and another item 43 was misread as 34. It was also found that the number of items was 90 and not 100. Then what is the correct mean?
