Take a square billet with a side length of 0.8 meters and cast it into a rectangular steel with a cross-sectional area of 20 square decimeters. How long is the cast steel?
把一个棱长是0.8米的正方体钢坯，铸造成横截面的面积是20平方分米的长方体钢材，铸造成的钢材有多长？
<gadget id="calculator">0.8 / 0.2</gadget>
<output>4</output>

<gadget id="calculator">0.8 * 0.8 * 4</gadget>
<output>2.56</output>

<result>2.56</result>