Cut off the four corners of a rectangular iron sheet to form a square with a side length of 2 cm, and weld it into a rectangular iron box (not counting the loss of joints). This iron box can hold 320 ml of water in total. The width of the rectangular iron sheet has been measured to be 14 centimeters, and what is the length in centimeters.
把一块长方形铁皮的四角剪去四个边长2厘米的正方形后，焊接成长方形铁盒(接头损耗不计)，这个铁盒共能装水320毫升．已量得长方形铁皮的宽为14厘米，长是多少厘米．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">14 - 4</gadget>
<output>10</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">320 / 20</gadget>
<output>16</output>

<gadget id="calculator">16 + 4</gadget>
<output>20</output>

<result>20</result>