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Average Aptitude Concepts

Average Aptitude Test Paper 8

36) The average age of a group of 6 boys is 19. If the new average age after a boy joins the group is 21.28, find the age of new boy.

  1. Approx 23
  2. Approx 32
  3. Approx 35
  4. Approx 45

Answer: C

Explanation:
Use Formula:
Age of new body= New average + Number of boys initially * increase in average
= 21.28 + 6*2.28
=21.28 + 13.68
= 34.96

37) The average weight of a group of 5 boys is 26. If we replace a boy of weight 25 in the group with another boy so that new average increases by 3, find the weight of the new body.

  1. 56
  2. 34
  3. 40
  4. 33

Answer: C

Explanation:
The weight of new person = Weight of the removed person + No. of persons * Increase in average.
= 25+5*3
=25+15
= 40

38) Find the average of first 6 consecutive even numbers.

  1. 6
  2. 4
  3. 0
  4. 7

Answer: D

Explanation:
The average of first n consecutive even numbers is given by:
= n+1
Here, n=6
= 6+1
= 7

39) Find the average of first 9 consecutive odd numbers.

  1. 9
  2. 4
  3. 0
  4. 7

Answer: A

Solution:
The average of first n consecutive odd numbers is equal to n.
Here, n=9
So, it is 9.

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