Question 1154070
father, 4n
son, n
{{{4n+6=3(n+6)}}}
-
{{{4n+6=3n+18}}}
{{{n=18-6}}}
{{{n=12}}}
--------------{{{4n=48}}}--------father now


Five years ago:
{{{48-5=highlight(43)}}}-------------father's age five years ago