A square billet with a side length of 4 meters is forged into a rectangular steel with a cross section of 0.8 square meters. How long is the forged steel? (solution with equation)
一块棱长是4米的正方体的钢坯，锻成横截面是0.8平方米的长方体钢材，锻成的钢材有多长？(用方程解答)
<gadget id="calculator">4 * 4 * 4</gadget>
<output>64</output>

<gadget id="calculator">64 / 0.8</gadget>
<output>80</output>

<result>80</result>