A cube is cut from the middle and its surface area increases by 18 square meters. What is the volume of the cube in cubic meters?
一个正方体，从中间截开后表面积增加18平方米，这个正方体的们体积是多少立方米．
<gadget id="calculator">3 * 3 * 3</gadget>
<output>27</output>

<result>27</result>