Joe's age, Joe's sister's age and Joe’s fathers age sums up to a century. When son is as old as his
father, Joe's sister will be twice as old as now. When Joe is as old as his father then his father is twice as
old as when his sister was as old as her father

• Joe+sister+father=100
  after x years lets joe age is equal to hi father
  joe+x=father
  therefore, sister+x=2*sister
  =>sister=x
  joe+sister=father
  therefore, 2*father=100
  hence, Father=50
• 10 years agoHelpfull: Yes(25) No(4)
• Joe=20 Sister=30 Father=50
• 10 years agoHelpfull: Yes(6) No(16)
• can u explain?? @sumyodeep
• 10 years agoHelpfull: Yes(4) No(1)
• Joe= 20 Joe's sister = 30 Joe's father = 50
  
  So now, we can add up the three members and can get the sum 100.
  
  now the son is as old as his father , i.e Joe= 50 years
  
  Joe's sister= 60 (twice as old)
  
  case 2
  
  joe = 50 ( as old as father)
  sister = 50 (as old as father)
  father= 100 (twice as old)
  
  hence father is twice as old as when sister is as old as her father. it would be better if there were options.
  
• 10 years agoHelpfull: Yes(2) No(8)
• I think the answer is joe=25,joe sis=25,joe fath=50.
• 10 years agoHelpfull: Yes(1) No(2)
• please anyone can explain the solution ?
• 10 years agoHelpfull: Yes(0) No(0)
• can anyone explain the solution correctly???
• 10 years agoHelpfull: Yes(0) No(0)