A square iron block with a side length of 10 cm is forged into a rectangular parallelepiped iron bar with a width of 5 cm and a height of 10 cm. What is the length of the iron bar?
把一块棱长10厘米的正方体铁块，锻造成宽5厘米，高10厘米的长方体铁条，这个铁条的长是多少？
<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">10 / 50</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 * 10 * (1/5)</gadget>
<output>20</output>

<result>20</result>