Question 942727
{{{C=D+8}}}
In 4 years,
{{{C+4+D+4=84}}}
{{{C+D=76}}}
Substitute from the first equation,
{{{D+8+D=76}}}
{{{2D+8=76}}}
{{{2D=68}}}
{{{D=34}}}
and
{{{C=34+8}}}
{{{C=42}}}