A lead wire with a length of 42 cm is bent into a rectangle so that the ratio of length to width is 4:3. If this rectangle is placed on the table, what is the area enclosed by it?
把一根长为42厘米的铅丝弯成一个长方形，使长与宽的比是4：3，如果将这个长方形放在桌面上，它围成的面积是多少平方厘米？
<gadget id="calculator">42 / 2</gadget>
<output>21</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">21 * (4/7)</gadget>
<output>12</output>

<gadget id="calculator">21 - 12</gadget>
<output>9</output>

<gadget id="calculator">12 * 9</gadget>
<output>108</output>

<result>108</result>