# Average Questions and Answers updated daily – Aptitude

15 Average Questions and answers section with explanation for various online exam preparation, various interviews, Aptitude Average online test. Average Questions with detailed description, explanation will help you to master the topic.

## Average Questions

1. When a student weighing 45 kgs left a class, the average weight of the remaining 59 students increased by 200g. What is the average weight of the remaining 59 students

Correct Ans:57
Explanation:
Let the average weight of the 59 students be A.
So the total weight of the 59 of them will be 59*A.

The questions states that when the weight of this student who left is added, the total weight of the class = 59A + 45
When this student is also included, the average weight decreases by 0.2 kgs

59A+45 / 60=A−0.2

=> 59A + 45 = 60A - 12
=> 45 + 12 = 60A - 59A
=> A = 57

2. 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

Correct Ans:45
Explanation:

3. 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

Correct Ans:42
Explanation:

4. The average of six numbers is X and the average of three of these is Y.If the average of the remaining three is z, then

Correct Ans:2X=Y+Z
Explanation:
X =((3y+3z)/6)
or
2X= y + z

5. 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

Correct Ans:40
Explanation:
Sum of the present ages of husband, wife and child = (27 * 3 + 3 * 3) years = 90 years.

Sum of the present ages of wife and child = (20 * 2 + 5 * 2) years = 50 years.

Husband's present age = (90 - 50) years = 40 years

6. Average of 10 matches is 32, How many runs one should should score to increase his average by 4 runs.

Correct Ans:76
Explanation:
Average after 11 innings should be 36

So, Required score = (11 * 36) - (10 * 32)
= 396 - 320 = 76

7. Average weight of 10 people increased by 1.5 kg when one person of 45 kg is replaced by a new man. Then weight of the new man is

Correct Ans:60
Explanation:
Total weight increased is 1.5 * 10 = 15.
So weight of new person is 45+15 = 60

8. A batsman makes a score of 87 runs in the 17th match and thus increases his average by 3. Find his average after 17th match

Correct Ans:39
Explanation:
Let the average after 17th match is x
then the average before 17th match is x-3

so 16(x-3) + 87 = 17x
=> x = 87 - 48 = 39

9. Average age of boys in a class is 16 years and average age of girls is 15 years, what is the average age of all

Correct Ans:cant be computed
Explanation:
As number of girls and boys is not given so result cant be computed

10.

Correct Ans:9
Explanation:
Average=3(1+2+3+4+5) / 5=45 / 5=9

11. Average of 10 numbers is zero. At most how many numbers may be greater than zero

Correct Ans:9
Explanation:

12. Find the average of first 10 multiples of 7

Correct Ans:38.5
Explanation:
=7(1+2+3+...+10) / 10

=7(10(10+1)) / 10ï¿½2

=7(110) / 10ï¿½2=38.5

13.     Find the sum of first 30 natural numbers

Correct Ans:465
Explanation:
Sum of n natural numbers
=n(n+1)/2

=30(30+1)/2
=30(31)/2=465

14.   Reeya obtained 65, 67, 76, 82 and 85 out of 100 in different subjects, What will be the average.

Correct Ans:75
Explanation:
65+67+76+82+85/5=75

15. Average of all prime numbers between 30 to 50

Correct Ans:39.8
Explanation:
Prime numbers between 30 and 50 are:
31, 37, 41, 43, 47

Average of prime numbers between 30 to 50 will be
(31+37+41+43+47/5)=199/5=39.8

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