Question

The average of 30 results is 20
and the average of other 20 results
is 30. What is the average
of all the results ?
(1) 24 (2) 48
(3) 25 (4) 50

Answer 1

Answer :

• Hence Average of results is 24
• Option (1)

Given :

• The average of 30 results is 20
• The average of other 20 results is 30

To find :

• The average of all the results

Solution :

Given that,

• Average of 30 results is 20 Then,

》 Total score of 30 results = 30 × 20 = 600

• Average of other 20 results is 30 Then ,

》Total score of other 20 results = 20 × 30 = 600

Now

• Total Number of scores = 20 + 30 = 50
• Total scores = 600 + 600 = 1200

• 》Now , Average = Total score / Total Number of results

Where , Total score is 1200 and total number of results is 50

》 Average = 1200/50

》Average = 24

Hence Average of results is 24

Option (1)