Problems on Average- Aptitude Questions and Answers

Problems on Average- Aptitude Questions and Answers-:
This is aptitude on Problems on Average Question and answers with explanation for different interviews and competitive and entrance exams.
1.The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.4 the sixth number is?
A. 11.0
B. 11.3
C. 11.4
D. 11.5

2.The average of first 10 natural numbers is?
A. 5
B. 5.5
C. 6.5
D. 6

3.The average of first five prime numbers greater than 20 is?
A. 31.00
B. 31.01
C. 32.00
D. 32.2

4.A team of eight entered for a shooting competition. The best marks man scored 85 points. If he had scored 92 points, the average scores for. The team would have been 84. How many points altogether did the team score?
A. 625
B. 665
C. 632
D. 656

5.A man purchased 3 blankets @ Rs.100 each, 5 blankets @ Rs.150 each and two blankets at a certain rate which is now slipped off from his memory. But he remembers that the average price of the blankets was Rs.150. Find the unknown rate of two blankets?
A. Rs.150
B. Rs.225
C. Rs.250
D. Rs.450

6.The average age 9 members of a committee are the same as it was 2 years ago, because an old number has been replaced by a younger number. Find how much younger is the new member than the old number?
A. 7 years
B. 11 years
C. 18 years
D. 27 years

7.The average marks in mathematics scored by the pupils of a school at the public examination were 39. If four of these pupils who actually scored 5, 12, 15 and 19 marks at the examination had not been sent up, the average marks for the school would have been 44. Find the number of pupils sent up for examination from the school?
A. 20
B. 25
C. 30
D. 32

8.Find the average of the first 20 natural numbers?
A. 10
B. 11.5
C. 12
D. 10.5

9.A batsman makes a score of 64 runs in the 16th innings and thus increased his average by 3. Find his average after the 16th inning?
A. 17
B. 29
C. 18
D. 19

10.The sum of five numbers is 655. The average of the first two numbers is 85 and the third number is 125. Find the average of the two numbers?
A. 180
B. 170
C. 190
D. 175