from current ,10 yr ago ... family of 8 member have total age =231
then ,3 yr later , 1 people died(age=60) and 1 child born ,now age of family = 231+3*8 -- 60 = 195
then ,another 3 yr later , 1 member died(age =60), and 1 child born , so age of family = 195+3*8--60= 159,
now ,question ask aboubt current age of menmber (average age) of family =
current = (159 (which is 4yr ago(10-3-3 ) + 4*8) / 8= 23.8 = 24 yr
so answe should be 5) option