Question 893186
Four years ago:  {{{(A-4+B-4)/2=18}}}
{{{(A+B)-8=36}}}
{{{(A+B)=44}}}, the sum of their current ages.


Presently:  {{{(A+B+C)/3=24}}}
{{{A+B+C=72}}}
{{{C=72-A-B}}}
{{{C=72-(A+B)}}}
{{{C=72-44}}}
{{{C=28}}}, present age of C.


Age for C in eight more years:
{{{C+8}}}
{{{28+8}}}
{{{highlight(36)}}}