Question 368247
Let P be the number of plain pennants, F fancy pennants.
Total number of pennants:
1.{{{P+F=30}}}
Total value of pennants:
{{{4P+8F=186}}}
2.{{{2P+4F=93}}}
Multiply eq. 1 by (-2) and add to eq. 2,
{{{-2P-2F+2P+4F=-60+93}}}
{{{2F=33}}}
{{{F=33/2}}}
There is a problem with your problem setup.
The expected numbers for P and F are integers unless someone buys 1/2 of a pennant. 
Please check the problem and re-post.