A cuboid becomes a cube if its height increases by 2 cm, and its surface area increases by 24 square centimeters. What is the original surface area of this cuboid?
一个长方体如果高增加2cm就成了一个正方体，而且表面积增加24平方厘米，原来这个长方体的表面积是多少平方厘米？
<gadget id="calculator">24 / 4 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 * 3 * 2</gadget>
<output>18</output>

<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">3 * 1 * 4</gadget>
<output>12</output>

<gadget id="calculator">18 + 12</gadget>
<output>30</output>

<result>30</result>