The ages of two friends is in the ratio 3:4. After how many years will the ages be in the ratio 7:8?

• The ages are in the ratio 3:4
  3+x 7
  ---- = --
  4+x 8
  
  cross multiply
  8(3+x)=7(4+x)
  24+8x=28+7x
  x=28-24
  x=4
  After 4 years their ages will be in the ratio 7:8
• 13 years agoHelpfull: Yes(13) No(2)
• after 40 years
  because if the age may be 30,40...then
  after 40 years there age will be 70,80..
  so the ratio is 7:8
• 13 years agoHelpfull: Yes(3) No(1)
• after 4 years.
• 13 years agoHelpfull: Yes(2) No(0)
• after 20 years
  15/20
  35/40
• 12 years agoHelpfull: Yes(0) No(0)
• let present age is 3x and 4x
  after 4 years it become 7x and 8x that is the ratio of 7:8
  that our answer is 4 years
• 12 years agoHelpfull: Yes(0) No(1)