<PRE><B>Question 917761</B>
&lt;pre&gt;
1 inch represents 20 miles, therefore

(1 inch)&lt;sup&gt;2&lt;/sup&gt; represents (20 miles)&lt;sup&gt;2&lt;/sup&gt;.  Therefore

1&lt;sup&gt;2&lt;/sup&gt; inch&lt;sup&gt;2&lt;/sup&gt; represents 20&lt;sup&gt;2&lt;/sup&gt; miles&lt;sup&gt;2&lt;/sup&gt;. Therefore,

1&lt;sup&gt;2&lt;/sup&gt; inch&lt;sup&gt;2&lt;/sup&gt; represents 20&lt;sup&gt;2&lt;/sup&gt; miles&lt;sup&gt;2&lt;/sup&gt;. Therefore

1 inch&lt;sup&gt;2&lt;/sup&gt; represents 400 miles&lt;sup&gt;2&lt;/sup&gt;. Therefore,

1 square inch represents 400 square miles.  Therefore,

since 1600 square miles = 4 times 400 square miles,

4 square inches represents 1600 square miles.

Edwin&lt;/pre&gt;</PRE>