Answer:
Total age of Four members =54×4=216
Let the age of first peron be x
Age of second person = x+2
Age of third person = x+4
Age of Fourth person = x+6
So 4x+12=216→x=51
Age of youngest member = 51 Years
Age of oldest member = 57 years
Sum of ages of both = 51+57=108 years