A cube of steel with a side length of 20 cm is forged into a cuboid steel with a width of 5 cm and a height of 4 cm. What is the length of this cuboid?
把一块棱长为20cm的正方体钢材煅造成宽是5cm，高是4cm的长方体钢材．这个长方体的钢材长是多少？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">20 / 20</gadget>
<output>1</output>

<gadget id="calculator">20 * 20 * 1</gadget>
<output>400</output>

<result>400</result>