If a square steel with a length of 4 meters is cut into two sections, the surface area is increased by 50cm**2, what is the original volume of the square steel?
把一根长为4米的方钢，截成2段，表面积增加了50cm**2，原来那根方钢的体积是多少？
<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">4 * 100</gadget>
<output>400</output>

<gadget id="calculator">25 * 400</gadget>
<output>10_000</output>

<result>10_000</result>