Put together a cuboid and a cube to form a new cuboid. The surface area of the new cuboid is 80 square centimeters larger than that of the original cuboid. Find the surface area of the cube.
把一个长方体和一个正方体拼成一个新的长方体，这个新长方体的表面积比原来的长方体的表面积增加了80平方厘米，求正方体的表面积．
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">20 * 6</gadget>
<output>120</output>

<result>120</result>