There is a piece of iron with a side length of 80 centimeters, and now it is melted and cast into a cuboid with a cross-sectional area of 20 square centimeters. What is the length of this cuboid in centimeters?
有一块棱长是80厘米的正方体的铁块，现在要把它溶铸成一个横截面积是20平方厘米的长方体，这个长方体的长是多少厘米？
<gadget id="calculator">80 / 20</gadget>
<output>4</output>

<gadget id="calculator">80 * 80 * 4</gadget>
<output>25_600</output>

<result>25_600</result>