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?\nOptions:\n(A) 20\n(B) 25\n(C) 30\n(D) 38\n(E) 40 OK. Let's think. Some random thoughts first:
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Sum of the ages of the group having 4 persons and average 40 = 4x40 = 160\nSum of the ages of the group having 5 persons and average 38 = 5x38 = 190\nAge of the new person added to the group = 190-160 = 30 The answer: (C).
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