Free Practice Questions for Average in Maths

Practice questions here, for every subject and every exam. Unlimited questions for unlimited attempts, given with answers and explanations.


Question 21:

The average of seven consecutive positive integers is 259 . If the next five odd numbers are included, then what is the average of all the numbers (correct to two decimal places)?

Question 22:

The average age  of 40 students of a class is 12 years. After adding teacher's age, the average age of all of them becomes 13 years. If the retirement age of the teacher is 55 years, then he will retire after

Question 23:

The average of eleven consecutive positive integers is d. If the last two numbers are excluded, by how much will the average increase or decrease?

Question 24:

The average of 10 observations is 46 . It was realised later that an observation was misread as 42 in place of 142 . The correct average is

Question 25:

If the average of the following six observations: $x+2, x+5, x+8$, $x+11, x+14$ and $x+17$ is $12.5$, what is the average of the first three observations?

Question 26:

There are five numbers. The average of the first four numbers is $\frac{5}{6}$ of the fifth number. If the average of all the five numbers is 26 , then what is the fifth number ?

Question 27:

The average age of $66 \frac{2}{3} \%$ of the number of children in a group is 13 years. The average age of all the children in the group is $14.5$ years. What is the average age (in years) of the remaining children?

Question 28:

The average age of 26 students in a class is 15 years. If the teacher's age is included in it, then the average will increase by one. What is the teacher's age (in years)?

Question 29:

The average of 4,6,8,12 and $x$ is 7 and the average of $x$, 9,13,15 and $y$ is 9 . What is the value of $2x-3y$?

Question 30:

There are two sections A and B of a class, consisting of 38 and 42 students, respectively. If the average weight of the students of section A is 55 kg and that of section B is 32 kg, find the average weight of all the students in the class.

Question 31:

The average age of 10 members of a family is 29 years. If the youngest members are twins and each is 5 years old, what was the average age (in years) of the family members at the time of birth of the twins?

Question 32:

The average weight of the students in a class is 56 kg. If five more students whose average weight is 58 kg join the class, the average weight of the students increases by 0.5 kg. What was the original number of students in the class?

Question 33:

The average of 19 numbers is 46 . The average of the first 5 numbers is 49 and the average of the next 6 numbers is 54 . What is the average of the remaining numbers ? (Correct to one decimal place)

Question 34:

The difference between the average of all those numbers between 50 and 7 which are divisible by 6 and the average of all prime numbers between 10 and 45 is

Question 35:

The average of twelve numbers is 38 . The average of the first three numbers is 33 , that of the next four numbers is $35 \frac{1}{2}$, and that of the next two numbers is 40 . If the tenth number is less than the eleventh and twelfth numbers by 4 and 5 , respectively, then the twelfth number is:

Question 36:

The average of seven odd numbers, taken in increasing order, is 79 . What is the average of the first five numbers?

Question 37:

A library has an average of 240 visitors on Sundays and 150 visitors on other days. The average number of visitors per day in a month of 30 days, which begins with Monday, is:

Question 38:

Find the average of all the numbers between 13 and 43 , which are divisible by 3

Question 39:

The average score of a group of students in a test is 64 . If 20 % students obtained an average score of 91 and 25% students obtained an average score of 31 , then what is the average score (correct to one decimal place) of the remaining students?

Question 40:

The average age of the students in a school is 13.2 years. The average age of the boys is 14.4 years and that of the girls is 12.3 years. The ratio of the number of girls to that of the boys is: