Arrange three perfectly equal cubes to form a cuboid. The surface area of this cuboid is 420 square centimeters. What is the surface area of each cube?
把三个完全相等的正方体摆成一个长方体，这个长方体的表面积是420平方厘米，每个正方体的表面积是多少平方厘米．
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">18 - 4</gadget>
<output>14</output>

<gadget id="calculator">420 / 14</gadget>
<output>30</output>

<gadget id="calculator">30 * 6</gadget>
<output>180</output>

<result>180</result>