There is a rectangular wheat experimental field in Qianjin Village. If the length of this experimental field is increased by 16 meters or the width is increased by 12 meters, the area will be increased by 480 square meters. What is the original area of the test field in square meters?
前进村有一块长方形小麦试验田，这块试验田如果长增加16米或者宽增加12米，面积都增加480平方米．这块试验田原来的面积是多少平方米？
<gadget id="calculator">480 / 16</gadget>
<output>30</output>

<gadget id="calculator">480 / 12</gadget>
<output>40</output>

<gadget id="calculator">30 * 40</gadget>
<output>1_200</output>

<result>1_200</result>