Averages (200 Questions with Explanation): Quantitative Aptitude Test

  • Averages
  • 11. Average of 13 results is 65. If the average of first six results is 61 and average of last six results is 59 Then find the seventh result?
   A.) 115
   B.) 135
   C.) 125
   D.) 105

Answer: Option 'C'

125

  • 12. Average of 13 results is 65. If the average of first six results is 61 and average of last six results is 59 Then find the seventh result?
   A.) 115
   B.) 135
   C.) 125
   D.) 105

Answer: Option 'C'

125

  • 13. The average weight of a class of 20 boys was calculated to be 58.4 kgs and it was later found that one weight was misread as 56 kg instead of 65 kg. What is the correct weight? 
   A.) 67.4kg
   B.) 57.75kg
   C.) 58.85kg
   D.) 49.4kg

Answer: Option 'C'

Actual total weight is (20 × 58.4 - 56 + 65) = 1177 Kgs
Actual average weight is 1177/20 = 58.85kgs

  • 14. The average weight of a class of 20 boys was calculated to be 58.4 kgs and it was later found that one weight was misread as 56 kg instead of 65 kg. What is the correct weight? 
   A.) 67.4kg
   B.) 57.75kg
   C.) 58.85kg
   D.) 49.4kg

Answer: Option 'C'

Actual total weight is (20 × 58.4 - 56 + 65) = 1177 Kgs
Actual average weight is 1177/20 = 58.85kgs

  • 15. The average of 10 numbers is 25. The average of first three numbers is 22 1/3 and that of next five is 15 1/5. If the eighth be less than the ninth and tenth numbers by 5 and 11 respectively, then the tenth number is:
   A.) 29
   B.) 21
   C.) 41
   D.) 30

Answer: Option 'C'

41

  • 16. The average of 10 numbers is 25. The average of first three numbers is 22 1/3 and that of next five is 15 1/5. If the eighth be less than the ninth and tenth numbers by 5 and 11 respectively, then the tenth number is:
   A.) 29
   B.) 21
   C.) 41
   D.) 30

Answer: Option 'C'

41

  • 17. The average of 5 consecutive numbers is n. if the next two number are also included. The average will? 
   A.) Remain the same
   B.) Increase by 1
   C.) Increase by 2
   D.) Decrease by 1

Answer: Option 'B'

Increase by 1

  • 18. The average of 5 consecutive numbers is n. if the next two number are also included. The average will? 
   A.) Remain the same
   B.) Increase by 1
   C.) Increase by 2
   D.) Decrease by 1

Answer: Option 'B'

Increase by 1

  • 19. The average of marks of a student of 8 exams was 35. How many marks must be get in the next exam so as to increase his average of marks by 5?
   A.) 75
   B.) 80
   C.) 83
   D.) 79

Answer: Option 'B'

80

  • 20. The average of marks of a student of 8 exams was 35. How many marks must be get in the next exam so as to increase his average of marks by 5?
   A.) 75
   B.) 80
   C.) 83
   D.) 79

Answer: Option 'B'

80