The ratio of current age of X and Y is 5:7. After how many years their age becomes
7:9?

• answer 2x years, x=1,2....
  
  let their current ages are 5x ,7x
  
  after n years their ages becomes 7 :9
  
  then 5x+n/7x+n =7/9
  
  45x+9n =49x +7n
  
  2n= 4x
  
  n= 2x
  
  if x = 1 their ages 5,7 then n=2 after 2 years their ages 7,9
  x=2 their ages are 10,14 then n=4 after 4 years their ages 14,18
• 12 years agoHelpfull: Yes(12) No(1)
• 5 + x/7 +x = 7/9
  
  on solving we get x = 2;
• 12 years agoHelpfull: Yes(4) No(1)