There is a cube of iron with a side length of 20 cm, which is melted and cast into a cuboid with a cross-section of 50 cm2. What is the length of the cuboid in cm?
有一块棱长为20厘米的正方体铁块，熔铸成一个横截面是50平方厘米的长方体，长方体的长是多少厘米．
<gadget id="calculator">20 / 50</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 * 20 * (2/5)</gadget>
<output>160</output>

<result>160</result>