Question 1060208
{{{25Q+5N=675}}}
1.{{{5Q+N=135}}}
.
.
2.{{{Q+N=51}}}
Subtract 2 from 1,
{{{5Q+N-Q-N=135-51}}}
{{{4Q=84}}}
{{{Q=21}}}
So then,
{{{21+N=51}}}
{{{N=30}}}