There are 3 identical cubes. After putting them together into a cuboid, the surface area is reduced by 60cm**2. What is the surface area of each cube in cm**2?
有3个同样的正方体，将它们拼成一个长方体后，表面积减少了60cm**2，那么每个正方体的表面积是多少cm**2．
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

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

<result>90</result>