Question 994316
{{{system(n+d+q=41,5*n+10*d+25*q=495,d=q-7)}}}


{{{system(n+d+q=41,n+2d+5q=99,d=q-7)}}}


E1 and E2:
{{{system(n+q-7+q=41,n+2q-14+5q=99,d=q-7)}}}


{{{system(n+2q=48,n+7q=113)}}}


{{{(48-2q)+7q=113}}}

{{{5q=113-48}}}

{{{q=65/5}}}

{{{highlight(q=13)}}}


{{{highlight(d=6)}}},
{{{highlight(n=22)}}}