Find the age ratio after 4 years

Age ratio of x and y is 3:8, when difference of age is 35 yrs, find the age ratio after 4 yrs??

x/y = 3/8 & y - x = 35 ---------------(I)
or 8x = 3y ---------(II)
from(I) & (II) 8/3x - x = 35
or 5/3x= 35
or x= 21 & y = 35+ 21 = 56
after 4 years age of x= 21+4 = 25
that of y = 56 + 4 = 60
x/y = 25/60 = 5/12
so age ratio of x& y after 4 years is 5 : 12 answer