Question 426356
<pre>
           NOW      IN 5 YEARS
Father      9x      9x+5
Son          x      x+5
</pre>

{{{highlight_green(9x+5=4(x+5))}}}


{{{9x+5=4x+20}}}

{{{5x=15}}}

{{{highlight(x=3)}}} the son now

Father now, {{{highlight(27)}}}