Forge a square billet with a side length of 4dm into a rectangular parallelepiped steel with a height and a width of 25cm. What is the length of the steel?
把一棱长为4dm的正方体钢坯锻造成，高和宽都是25cm的长方体钢材，钢材的长是多少？
<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">25 * 25</gadget>
<output>625</output>

<gadget id="calculator">40 / 625</gadget>
<output>8/125 = around 0.064</output>

<gadget id="calculator">40 * 40 * (8/125)</gadget>
<output>512/5 = around 102.4</output>

<result>512/5 = around 102.4</result>