Question 1002848
Redo the first sentence.  The usage is not understandable.  Are you trying to say for m man and s son, {{{m/s=5}}}, or {{{m=s+5}}} or what?


One-word change could go as, "A man is five times as old as his son...", and then this would be  {{{m/s=5}}}.  The description would then give the system  {{{system(m/s=5,m+15=2(s+15))}}}.  Solving would be clear.


{{{5s+15=2s+30}}}
{{{3s=15}}}
{{{highlight_green(s=5)}}}