Put together a cube and a cuboid to form a new cuboid. The surface area of the new cuboid is 30 square centimeters larger than that of the original cuboid. What is the surface area of the cube in flat centimeters?
把一个正方体和一个长方体拼在一起，组成一个新的长方体，新长方体的表面积比原长方体的表面积增加30平方厘米，正方体的表面积是多少平放厘米．
<gadget id="calculator">30 / 4</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">(15/2) * 6</gadget>
<output>45</output>

<result>45</result>