Answer
See graph.
\begin{cases} 2x+5y\leq640\hspace2cm(arabica-beans) \\ 2x+y\leq240\hspace2cm(robusta-beans)\\x\geq0, y\geq0\end{cases}
Work Step by Step
Step 1. Assume the $x$ number of number of Standard and $y$ number of Deluxe packages,
Step 2. Set up the inequalities based on the given conditions:
\begin{cases} 4x+10y\leq80\times16oz\hspace2cm(arabica-beans) \\ 12x+6y\leq90\times16oz\hspace2cm(robusta-beans)\\x\geq0, y\geq0\end{cases} or
\begin{cases} 2x+5y\leq640\hspace2cm(arabica-beans) \\ 2x+y\leq240\hspace2cm(robusta-beans)\\x\geq0, y\geq0\end{cases}
Step 3. We can graph the solution set as shown (solution region).
