Skip to main content

Aptitude Day 150

Problems on Average:

1. Find the average of first 20 natural numbers.

Solution:
                Sum of 1st 20 natural numbers = n(n+1)/2 = 20(21)/2 = 210.
             
                Average = Sum of observations/ Number of observations
                              = 210/20
                              = 10.5.

2. Find the average of first 10 multiples of 5.

Solution:
                Sum of 1st 10 multiples of 5= 5 [n(n+1)/2] = 5[10(11)/2] = 275.
             
                Average = Sum of observations/ Number of observations
                              = 275/10

                              = 27.5.

Comments

Post a Comment

Popular posts from this blog

Aptitude Day 5

Answers of Day 4 :   1. 9                                   2. 5                                   3. 9                                   4. 8 To find the unit digit in the product. This is similar to the last model where we will find the unit digit of the sum. Example: 432*459*28*48=? Solution:  2*9=18 , 8*8=64, 4*8= 32. The unit digit of the total product is 2.  Problems to solve Find the unit digit of the product in the following 1. 404*397*810*21 =? 2. 24*42*36*78 =? 3. 81*82*89 =? 4. 72*36*98*47 =? See you tomorrow friends... Check out the answers over here  Aptitude Day 6
Post a Comment
Read more

Aptitude Day 59

Answers of Day 58:     1. 1/90.     2. 20 Problems to solve: 1. The product of two numbers is 33 and the sum of their squares is 130. Find their difference. 2. The sum of two numbers is 100 and their difference is 20. Find their product.
Post a Comment
Read more

Vocabulary Day 55

Dilemma Thesaurus: Noun : problem            double bind, difficulty, crisis, embarrassment, mess, puzzle...  Antonyms :  solution...  Example sentences:                  That's a serious dilemma we should think about that.          He'll never share his dilemma with anyone. 
Post a Comment
Read more