A section of square steel is 30 cm long and has a square cross-section. After sawing it into two equal sections, the surface area increases by 18 cm2. What is the volume of the original steel in cubic centimeters?
一段方钢长30厘米，横截面是正方形，把它锯成相等的两段后表面积比原来增加18平方厘米，原来钢材的体积是多少立方厘米．
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">9 * 30</gadget>
<output>270</output>

<result>270</result>