Take a cuboid billet with a length of 80 cm, a width of 20 cm, and a thickness of 30 cm, and forge it into a cuboid steel with a side length of 20 cm in cross section. How long is the forged steel?
把一个长80厘米，宽20厘米，厚30厘米的长方体钢坯，锻成横截面是边长20厘米的长方体钢材，锻成的钢材有多长？
<gadget id="calculator">20 * 20</gadget>
<output>400</output>

<gadget id="calculator">30 / 400</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">80 * 20 * (3/40)</gadget>
<output>120</output>

<result>120</result>