Question

The average of first 20 results is 20. and that of next 30 results is 30. What is the average of all 50
results?
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Answer 1

Answer:

the average of all 50 = 20 + 30 / 2

= 50 / 2

= 25

Answer 2

Given: The average of first 20 results is 20. Average of next 30 results is 30.

To find: Average of all 50 results

Explanation: Average of first 20= 20

=> Sum of first 20/20 = 20

=> Sum of first 20 = 20*20= 400

Average of next 30= 30

=> Sum of next 30/30 = 30

=> Sum of next 30 = 30*30 = 900

Sum of all 50 results= 400+900

= 1300

Total number of results= 50

Average= Sum /50

= 1300/50

= 26

Therefore, the average of all 50 results is 26.