A person says that his son is 5 times as old as his daughter and his wife is 5 times older than his son and he is twice the age of his wife . The sum total of all the ages equals the age of the grand mother who celebrated her 81st birthday today.
How old was his son?

• Son is 5 yrs old.
  Daughter is 1 yr old.
  Wife is 25 yrs old.
  Person himself is 50 yrs old.
• 12 years agoHelpfull: Yes(29) No(0)
• Let the daughter age be 'x'
  Therefore, Son age = 5x, Mother age = 25x, Person age = 50x.
  
  Thus we get, x+5x+25x+50x = 81
  81x = 81
  x = 1
  
  Daughter's age = 1, Son's = 5, Mother's = 25, Person's = 50.
• 12 years agoHelpfull: Yes(27) No(0)
• let age of daughter=x;son=5x;wife=25x;person=50x
  x+5x+25x+50x=81
  x=1
  hence son =5*1=5years
• 12 years agoHelpfull: Yes(3) No(0)
• let the age of his daughter be x,son=5x wife=25x,himself=50x;total=x+5x+25x+50x=81
  81x=81==>x=1so son=5x=5*1=5yrs
• 10 years agoHelpfull: Yes(1) No(0)
• son is 5yr old
  daughter is 1yr old
  wife is 25yr old
  a person is 50yr old
• 12 years agoHelpfull: Yes(0) No(0)
• His son age was 5
  
  Daughter 1 years old
  Son 5 yrs old
  wife 25 yrs old
  He 50 yrs old
  
• 12 years agoHelpfull: Yes(0) No(0)
• D*5=S
  S*5=W
  W*2=F
  D+S+W+F=81
  D+D*5+W+W*2=81
  6*D+3*W=81
  6*D+15*S=81
  6D+15*5*D=81
  81*D=81
  D=1
• 12 years agoHelpfull: Yes(0) No(3)
• son=5d
  wife=5son
  person=2wife
  grand mother celebrates her bday 2day, so gm=80
  as in question, son+wife+person=gm
  clearly,5d+25d+50d=80
  a
  d=1
  so son age is 5
• 11 years agoHelpfull: Yes(0) No(0)
• daughter......son......wife......husband
  x..........5x.....5*5x.....2*(5*5x)
  therefore,
  
  x+5x+5*5x+2*(5*5x)=81
  
  x=1
  
  son's age=5 years
• 11 years agoHelpfull: Yes(0) No(0)