Question 1055295
{{{A=10+S}}}
Three years ago,
{{{A-3=2(S-3)}}}
Substituting,
{{{10+S-3=2S-6}}}
{{{S+7=2S-6}}}
{{{-S=-13}}}
{{{S=13}}}
So, 
{{{A=10+13}}}
{{{A=23}}}