A rectangular piece of land, the ratio of length to width is 7:3, the width is 24 meters less than the length, what is the area of the land in square meters?
一块长方形的土地，长与宽的比是7：3，宽比长少24米，这块土地的面积是多少平方米？
<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">6 * 7</gadget>
<output>42</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">42 * 18</gadget>
<output>756</output>

<result>756</result>