Question 862919
x = age of father
y = age of son


Today:  {{{x=2y}}}


Twenty Years Ago:  {{{(x-20)=12(y-20)}}}


{{{2y-20=12(y-20)}}}
{{{2y-20=12y-240}}}
{{{2y-12y=-240+20}}}
{{{-10y=-220}}}
{{{highlight(y=22)}}}