Question 744574
FIVE children, one father
y, age of father
C, sum of ages of the five children


{{{system(y=C,2(y+12)=C+5*12)}}}---------the description


{{{system(y=C,2y+24=C+60)}}}

Using second equation
{{{2y=C+36}}}
substituting for C,
{{{2y=y+36}}}

{{{highlight(y=36)}}} father's current age