Q. When I become as old as my father is now, I will be 5 times the age of my son and my son will be 8 yrs older than what I am now. father+my age=100. How old is my son now?

• Let X be the my father's age, Y be the my age.
  1)Given X+Y=100-----(1)
  2)if I becomes as old as my father is now----> if Y becomes X
  3)then my son's age is X/5;
  also given X/5=Y+8;----------(2)
  By solving (1)&(2) X=90,Y=10 then
  My son age =X/5 =18;
• 11 years agoHelpfull: Yes(10) No(2)
• father's age .. 65,
  my age .. 35
  
  son's age = 13 yrs
• 12 years agoHelpfull: Yes(7) No(12)
• For problems such as these always start by making a table. This will help in setting up equations faster.
  
  Now Future
  Father x
  Me 100-x x
  Son y 100-x+8
  
  From statement 1
  x = 5y ----------------------- Eq1
  
  From my age
  Time taken to future = x - (100-x) = 2x-100
  
  From my sons age
  Time taken to future = (108-x) - y
  
  Equating
  2x-100 = 108-x-y
  or
  3x+y = 208 ------------- Eq2
  
  Substitute x from Eq1 in Eq2
  15y +y = 208
  16y = 208
  y = 13
  
  My Sons age in 13, My father is 65 & I am 35
• 7 years agoHelpfull: Yes(4) No(1)
• can anyone explain this.
• 9 years agoHelpfull: Yes(0) No(0)
• My age = 10
  Father age = 90
  
  After 80 years,
  My age = 90
  My son's age = 18
  
  So my son is 18 years old now.
• 6 years agoHelpfull: Yes(0) No(1)