 
 <translate> 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?
Options:
(A) 20
(B) 25
(C) 30
(D) 38
(E) 40 OK. Let's think. Some random thoughts first: <hau> Idan muna buƙatar canza matsakaicin shekarun ƙungiyar da ke ƙunshe da mutane 4 daga 40 zuwa 38 ta ƙara mutum ɗaya. Shekaru nawa ne ya kamata mutumin da aka ƙara a cikin rukunin ya kasance? Zaɓuɓɓuka: (A) 20 (B) 25 (C) 30 (D) 38 (E) 40 Yayi kyau. Bari mu yi tunani. Wasu tunani bazuwar farko: 