Take a rectangular iron sheet with a length of 32 cm, cut off a small square with a side length of 4 cm around it, and then make a box without a cover. Its volume is 768 cubic centimeters. Find the width of the original rectangle?
把一块长32厘米的长方形铁皮，在四周截去边长为4厘米的小正方形，再制成无盖的盒子，它的容积是768立方厘米，求原长方形的宽？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">32 - 8</gadget>
<output>24</output>

<gadget id="calculator">24 * 4</gadget>
<output>96</output>

<gadget id="calculator">768 / 96</gadget>
<output>8</output>

<gadget id="calculator">8 + 4 + 4</gadget>
<output>16</output>

<result>16</result>