Mathematical Aptitude Test: Average Practice Questions
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Mathematical Aptitude - Average
Question 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
_______
(A) 31
(B) 35
(C) 40
(D) 43
Question 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
_______
(A) 50
(B) 60
(C) 70
(D) 73
Question 3
The average of 17 numbers is 45. The average of the first 9 of these numbers is 51 and the last 9 of these numbers is 36. What is the ninth number?
(A) 14
(B) 16
(C) 18
(D) 20
Question 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
________
(A) 180 gm
(B) 200 gm
(C) 300 gm
(D) 360 gm
Question 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 is 5:1. What is the total of the ages (in years) of the boys in the class?
(A) 196
(B) 360
(C) 420
(D) 490
Question 6
The average weight of a class of 24 students is 35 kg. If the weight of the teacher is included, the average rises by 400 g. The weight of the teacher is
_________
(A) 40 kg
(B) 45 kg
(C) 50 kg
(D) 53 kg
Question 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?
(A) 63
(B) 66
(C) 67
(D) 69
Question 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
________
(A) 255
(B) 270
(C) 285
(D) 290
Question 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
________
(A) 36.33%
(B) 39.33%
(C) 40%
(D) 50%
Question 10
The average of the first five multiples of 3 is ______
(A) 3
(B) 6
(C) 9
(D) 12
Question 11
In a school, the average weight of 15 teachers was calculated as 58 kg. But later it was found that a teacher whose actual weight was 87 kg was wrongly taken as 78 kg. The actual average was
(A) 49 kg
(B) 58.6 kg
(C) 67 kg
(D) 100 kg
Question 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
(A) 1 year
(B) 1.5 years
(C) 2 years
(D) 2.4 years
Question 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?
(A) 6.5
(B) 6.25
(C) 6.75
(D) 7
Question 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
(A) 0
(B) 19
(C) 45
(D) 47.5
Question 15
In a family, the average age of the father and 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?
(A) 10 years
(B) 11 years
(C) 12 years
(D) 14 years
Question 16
The arithmetic mean of 15 numbers is 41.4. Then the sum of these numbers is
(A) 420
(B) 620
(C) 621
(D) 720
Question 17
Five years ago, the average age of P and Q was 15 years. The average age of P, Q and R today is 20 years. How old will R be after 10 years?
(A) 30 years
(B) 35 years
(C) 40 years
(D) 50 years
Question 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?
(A) 59 years
(B) 62 years
(C) 68 years
(D) 64 years
Question 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?
(A) 70
(B) 80
(C) 90
(D) 93
Question 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.
(A) 48 kgs
(B) 48.55 kgs
(C) 49.25 kgs
(D) 49.55 kgs