<PRE><B>Question 733744</B>
Problems like this require two equations.  The first equation describes the amount.  The second equation describes cost.&lt;P&gt;
Call flour f and cornmeal c.&lt;P&gt;
f + c &gt;= 4 - the total amount is greater or equal to 4 lbs.  You need at least 4 lbs - 4 lbs or more.&lt;P&gt;
1.5f + 2.5c &lt; 9.50 - the cost of each is # of lbs times the cost per pound.  And their sum must be less than $9.50.&lt;P&gt;
Solve the first equation for f in terms of c, then replace f in the second equation with that value. &lt;P&gt;
f &gt;= 4 - c.&lt;P&gt;
Since it&#39;s greater than or equal to 4-c, one valid solution results from it being equal.  So just use equal.&lt;P&gt;
1.5(4-c) + 2.5c &lt; 9.50&lt;P&gt;
6 - 1.5c +2.5c &lt; 9.50&lt;P&gt;
c &lt; 3.5&lt;P&gt;
Replace a valid value into the f = 4-c equation.  3 is less than 3.5.&lt;P&gt;
f = 4-3 = 1.&lt;P&gt;
Another solution is c = 2 lbs (that&#39;s less than 3.5)&lt;P&gt;
f = 4-2 = 2.&lt;P&gt;
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