If a cube is attached to a perfectly equal cube, the surface area increases by 60 square centimeters. What is the surface area of the cube in square centimeters?
一个正方体接上一个完全相等正方体后，表面积比原来增加了60平方厘米，这个正方体的表面积是多少平方厘米．
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<gadget id="calculator">15 * 6</gadget>
<output>90</output>

<result>90</result>