the age of 2 friends is in the ratio 5:6. After how many years will the age be in the ratio 7:8?

• let, the present ages be 5x and 6x.
  and after y year the ratio will be 7:8
  so,
  (5x+y)/(6x+y)=7/8
  or, y=2x
  so, the ans will be multiple of 2 that depends on the value of x, moreover, their present age.
  as, there is no data for their present age, u have to approach through options
  
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