Question 358695
1.{{{D+Q=40}}}
2.{{{10D+25Q>600}}}
From eq. 1,
{{{D=40-Q}}}
Substitute into eq. 2,
{{{10(40-Q)+25Q>600}}}
{{{400-10Q+25Q>600}}}
{{{15Q>200}}}
{{{Q>13.3}}}
There are at least 14 quarters in the collection.