The sum of the ages of a son and father is 65 years. After 5 years the age of father will be
double of the age of son. What is the age of son?

• x,y is the age of father and son respetively
  so c+y=65
  and x+5=2*y++10
  => x-2*y=5
  => x=2*y+5
  now put the value of x in
  x+y=65
  =>2*y+5+y=65
  =>y=20
  and x is 45
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• x+y=65
  
  x+5=2(y+5)
  
  y=20
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• x+y=65
  2(x+5)=(y+5) or y=2x+5
  so x+2x+5 = 65
  or x= 20 years
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• sum of ages of Son And Father After 5 years is 65+10(two Persons)=75
  But Given That after 5 years the ages are in 2:1 ratio
  That means 3 parts=75
  1 part=75/3=25
  father =50,son=25
  the present age of son is 25-5=20.
  
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• After 5 years total age becomes 75 ..so after 5 years age of some will become 25..so now the age of son is 20
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