 <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). <yor> Iye ọjọ ori ti ẹgbẹ ti o ni awọn eniyan 4 ati apapọ 40 = 4x40 = 160 Àpapọ̀ ọjọ́ orí àwùjọ tí ó ní ènìyàn márùn-ún àti apapọ 38 = 5x38 = 190 Ọjọ́ orí ẹni tuntun tí wọ́n fi kún àwùjọ = 190-160 = 30 Ìdáhùn: (C). 