The average of six numbers is 30. If the average of first four is 25 and that of last eight is 35, the fourth number is:

The average of six numbers is 30. If the average of first four is 25 and that of last eight is 35, the fourth number is:

A 25

B 30

C 35

D 40

Solution

Correct Answer: Option A

Fourth number = (4*25+3*35-6*30) =25