List of top Quantitative Aptitude Questions on Average asked in ATMA

There are two sections A and B of a class, consisting of 35 and 45 students respectively. If the average weight of all the students of section A is 38 kg and that of all the students of section B is 42 kg, then what is the average weight of all the students in both the sections together?
In a basketball team with 12 players, the average height of the players is 170 cm. Out of these players, the average height of 7 players is 166 cm. What is the average height of the remaining 5 players?
In a class with 20 students, the average score in a test is 15. Out of the 20 students, 5 students scored 0 mark. What is the average marks of the remaining student if the students who scored 0 mark are excluded?
A group of 11 natural numbers is arranged in ascending order. The average of the first six numbers is 18 and the average of the last six numbers is 28. If the 7th number is the smallest prime number greater than 20, then what is the sum of all these numbers?
What is the average of first five perfect squares ending in 6?
The average of a group of 12 numbers increases by 1.5 when one of the numbers is replaced by 9. What is the value of the number that was replaced?
What is the average of first 101 consecutive odd numbers?
In a class of 24 students, if one new student weighing 72 kg is added, then average weight of the class is increased by 1 kg. If one more student weighing 61 kg is added, then the average weight of the class increases by 1.5 kg over the initial average. What is the initial average weight (in kg) of the class?
A shopkeeper has a total daily collection of 11,200, 10,650, 11,870 and 12,180 in 4 consecutive months. What should be the daily collection in the fifth month such that the average daily collection for 5 months become 11,050?
20 friends went to a movie theatre. The average cost of the movie ticket for 19 friends was 120. But one of the friends paid 38 more than the average cost for all the 20 friends. What was the total amount paid by all of them together?
The average of three natural numbers X, Y and Z is 27. The average of X and Y is 22. X is a multiple of both 4 and 5 and is less than 30. What is the value of average of XY and YZ?
What will be the average of the squares of first five prime numbers of two digits?
In a group of 5 persons, the average height is 150 cm. The average height increases to 155 cm when a new person is added to the group. What is the height of the new person?
The price of rock salt is Rs.100 per kg. The price of pink salt is Rs.120 per kg. The price of white salt is Rs.20 per kg. 3 kg of each are taken and mixed together. What will be the average price per kg of the mixture?
What will be the last digit of the average of the first five consecutive natural numbers of two digits?
If the average of the first 9 integers in a series of 15 consecutive odd integers is 41, then what is the average of all the 15 odd integers in the series?
The average height of a group of 7 friends is 182 ems. If a person with a height of 170 cm leaves the group, then what would be the new average height?
The average weight of A, B and C is 80 kg. If the average weight of A and B be 74 kg and that of B and C be 84 kg, then what is the weight (in kg) of B?
The average of 10 results is 40 and the average of other 40 results is 10. What is the average of all the results together?
The mean of 15 observations is 30. If one more observation is included, then the new mean becomes 31. What is the 16th observation?
The average age of a class of 39 students is 15 years. If the age of the teacher be included, then the average increases by 3 months. Find the age of the teacher.
The average length of three tapes is 6800 feet. None of the tapes is less than 6400 feet. What is the greatest possible length of one of the other tapes?
The average salary of 3 workers is 95 Rs. per week. If one earns Rs.115 and second earns Rs.65 how much is the salary of the 3rd worker.
The times taken by a phone operator to complete a call are 9, 2,3,1,5 minutes respectively. What is the average time per call?
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.