Question 1116834
{{{system(n+q=20,n/20+q/4=4)}}}


{{{n+5q=80}}}
{{{n+5(20-n)=80}}}
{{{n+100-5n=80}}}
{{{-4n=80-100}}}
{{{4n=100-80=20}}}
{{{highlight(n=5)}}}