 
 <translate> 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 = 30 The answer: (C). <ibo> Nchịkọta nke afọ nke ìgwè nwere mmadụ 4 na nkezi 40 = 4x40 = 160 Nchịkọta nke afọ nke ìgwè nwere mmadụ 5 na nkezi 38 = 5x38 = 190 Afọ onye ọhụrụ a gbakwunyere n'ìgwè = 190-160 = 30 Azịza ya: (C). 