After joining two identical cubes into a cuboid, its surface is 400 square centimeters. What is the surface area of each cube in square centimeters?
把两个相同的正方体拼接成一个长方体后，其表面是400平方厘米，原来每个正方体的表面积是多少平方厘米．
<gadget id="calculator">400 / 10</gadget>
<output>40</output>

<gadget id="calculator">40 * 6</gadget>
<output>240</output>

<result>240</result>