If we need to change the average age of a group containing 4 persons from 40 to 38 by adding a person. What should be the age of the person newly added to the group?	Choose the correct choice
A) 20
B) 25
C) 30
D) 38
E) 40
Sum of the ages of the group having 4 persons and average 40 = 4x40 = 160   Sum of the ages of the group having 5 persons and average 38 = 5x38 = 190   Age of the new person added to the group = 190-160= 
<gadget id="calculator">190-160</gadget>
<output>30</output>
30   Answer: 30
<result>C</result>
If we need to change the average age of a group containing 4 persons from 40 to 38 by adding a person. What should be the age of the person newly added to the group?