Question 1079258
1.{{{N+Q=51}}}
and
{{{5N+25Q=410}}}
2.{{{N+5Q=82}}}
Subtract 1 from 2,
{{{N+5Q-N-Q=82-51}}}
{{{4Q=31}}}
Check your problem setup. 
Q and N are not integers which they need to be.
Please repost.