The ratio of current age of X and Y is 5:7,after hw many years der age ratio will b 7:9?

• current age ratio......x/y=5/7 => x=5parts and y=7parts....
  assume after 'p' years the ratio is 7/9.
  5+p/7+p=7/9
  then we get p=2 years...
• 13 years agoHelpfull: Yes(14) No(3)
• this problem wont have a definite solution...
  the easiest way is back calculation frm the given options
  
  u can solve this way too, like, if u take ratio constant to be 1, then after 2 yrs, their ages will b in the ration 7:9
  if ratio const=2, then after 4 yrs it will b 7:9
  if ratio const=3, then aftr 6 yrs and so on....
  so u'll get a relation like no. of yrs will be double the ratio const, or like a multiple of 2.. so luk at the options and then decide...
  
  u can also try with this eqn: take ratio const=x and no. of yrs=y,
  then u'll get (5x+y)/(7x+y)=7x/9x
  if u solv it ull get y=2x again.....
  
• 13 years agoHelpfull: Yes(12) No(2)
• ans is undetermine......how can u say tht 2 or or x year.....bcz u dnt know the age..so guyssssss ans is undetermine.....i am 20000000% sure..r u agree with me???hope so
• 13 years agoHelpfull: Yes(8) No(8)
• current age ratio = 5:7.
  increasing their age one by one till the ratio become 7:9...
  After one year = 6:8
  After 2 year = 7:9
  ANS= 2 years
• 13 years agoHelpfull: Yes(7) No(4)
• ratio=5:7
  after=7:9
  suppose after x year the ratio is 7:9
  
  soooo
  
  (5+x)/(7+x)=7/9
  9*(5+x)=7*(7+x)
  45+9x=49+7x
  2x=4
  
  x=2
• 9 years agoHelpfull: Yes(3) No(0)
• x/y=5/7
  =>7x-5y+0 ....(1)
  
  after z years.
  (x+z)/(y+z)=7/9
  =>9x-7y=-2z ....(2)
  by subtracting 1 & 2
  y-x=z.
  hence after y-x years
• 13 years agoHelpfull: Yes(2) No(6)
• after 2 years they will become 7:9
• 13 years agoHelpfull: Yes(2) No(4)
• The sum has indefinite solutions. After 2,4,6.... Years the ration is 7:9 , so we cannot say it is 2 years.
• 9 years agoHelpfull: Yes(0) No(0)
• 2 years... as let after x years the ratio will be 7:9.
  so the equation will be 5+p/7+p=7/9
• 9 years agoHelpfull: Yes(0) No(0)
• current age ratio......x/y=5/7 => x=5parts and y=7parts....
  assume after 'p' years the ratio is 7/9.
  5+p/7+p=7/9
  then we get p=2 years...
• 9 years agoHelpfull: Yes(0) No(0)
• B is the youngest.
• 9 years agoHelpfull: Yes(0) No(0)