Question 1150100
{{{system(5n+10d+25q=410,n/d=2,q-d=2)}}}


{{{system(n+2d+5q=82,n=2d,q=d+2)}}}


Question asks for d.
Simple substitution gives  {{{2d+2d+5*(d+2)=82}}}.
Solving for d should give a whole value.


{{{9d+10=82}}}

{{{9d=72}}}

{{{d=72/9}}}

{{{highlight(d=8)}}}