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 1:

The average of eleven numbers is 80. The average of the first four numbers is 74.5 and that of the next four numbers is 82.5. The nineth number is 6 more than the tenth number, and the tenth number is 6 less than the eleventh number. What is the average of the tenth and eleventh numbers?

Question 2:

The average of 12 number is 39 . The average of last 5 number is 35 , and that of the first four number is 40 . The fifth number is 10 less than the sixth number and 7 more than the seventh number. The average of the fifth and sixth number is:

Question 3:

The average weight of 15 students in a class increase by $1.5 \mathrm{~kg}$ when one of the students weighting $45 \mathrm{~kg}$ is replaced by a new student. What is the weight (in $\mathrm{kg}$ ) of the new student?

Question 4:

The average weight of the 9 persons in boat is increased by $1 \frac{1}{3} \mathrm{~kg}$ when one of the crew of weight $60 \mathrm{~kg}$ is replaced by a new person. The weight of new person is:

Question 5:

The average weight of 15 crewman in a boat increased by $\frac{1}{3} \mathrm{~kg}$ when one of the crewmen whose weight is $55 \mathrm{~kg}$ is replaced by new man. What is the weight of that new man.

Question 6:

The average of 50,70,40,20, a, and b is 50 and the average of 40,45,50,55,40, c, and d is 55 . What is the average of a, b, c, and d ?

Question 7:

In the first 10 overs of a cricket game, the run rate was only 6.4. What should be the average run rate in the remaining 40 overs to reach the target of 264 runs?

Question 8:

The mean of some observations is 54 . If each observation is increased by 8 and its sum is divided by 2 , then what is the mean of the resulting observations?

Question 9:

The average of 15 numbers is 55.4. The average of the first 6 numbers is 50 and the average of the next 4 numbers is 60.5. What is the average of the remaining numbers?

Question 10:

A student's marks were incorrectly entered as 92 instead of 78 . Due to this, the average marks of the class got increased by half. What is the number of students in the class?

Question 11:

The average weight of X and Y is 40 kg. The average weight of Y and R is 62kg and the average weight of X and R is 56 kg. The weight of X is:

Question 12:

A batsman in his $18^{\text {th }}$ innings makes a score of 80 and thereby increasing his average by 4 . What is his average after the $18^{\text {th }}$ innings?

Question 13:

The average weight of 5 persons increases by 2.8 Kg when a new person comes in place of one of them weighing 38 Kg. The weight of the new person is

Question 14:

The average score of nineteen students in a computer examination is 74 . It was detected that while working out the average by mistake the marks secured by one student were recorded as 65 in place of 56 . What is the correct average score (correct to one decimal place)?

Question 15:

The average marks obtained by 30 students in a Mathematics test, out of 100 , is 76 . Inadvertently, the marks of one student were written as 56 instead of 65 and the marks of another student were written as 84 instead of 48 . The correct average is:

Question 16:

What is the average of the prime numbers lying between 25 and 45?

Question 17:

The average height of 20 students of class 8 is 152 and the average height of 15 students of class 9 is 168 cm. What is the average height (to the nearest cm ) of the students of both classes?

Question 18:

The average weight of 56 students in a group is 55 kg. If 12 students of average weight 60 kg leave and 6 students of average weight 52.5 kg join the group, then the average weight of the remaining students in the group decreases by:

Question 19:

The average weight of 24 persons in a group is 72 kg. If 3 persons with average weight 78 kg leave the group and 4 persons of average weight 75 kg join the group, then what will be the average weight (in kg ) of the persons in the group now?

Question 20:

The average weight of 6 persons increases by 1.5 kg when a new person comes in place of one of them who was weighing 65 kg. What is the weight of the new person?