Question 892866
j for older broth
b for brother


Each starts as j=20 and b=8.


Some number of years pass, y.  At that time, their ages become:
20+y for older brother (John)
8+y for brother (Jim)


{{{highlight_green(20+y=5(8+y))}}}, the question.


{{{y+20=5y+40}}}
{{{-4y=20}}}
{{{y=-5}}}
This will not happen going forward in time.
John is already 2.5 times older than Jim.  The ratio will only decrease as y increases.


What is the exact problem description and question as given to you, word-for-word?