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 332

Answers of Day 331: 1. 450%.                                     2. 10.   Problems on Percentage: 1. 0.001 is what percent of 0.01? Solution:                   0.001/0.01 * 100 = 1/10* 100                                               = 10%. 2. A fruit seller had some apples. He sells 20% apples and still has 500 apples. Originally, he had: Solution:                (100-20)% of x = 500                80/100*x = 500                x = 625.
Post a Comment
Read more

Vocabulary Day 21

Stammer Thesaurus: Verb : stutter in speech, speak haltingly, speech defect           halt, hesitate, pause, stop, sputter... Antonyms : say quickly, pronounce, enunciate... Example sentences: ·          He was stammering when the teacher caught him red-handed. ·          One should avoid the stammering while delivering a speech. 
Post a Comment
Read more