Two identical cuboids are put together to form a cube whose edge length is 5 decimeters. What is the surface area of a cuboid in square decimeters?
两个完全一样的长方体，拼成了一个棱长是5分米的正方体，原来一个长方体的表面积是多少平方分米．
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">5 * 2.5</gadget>
<output>12.5</output>

<gadget id="calculator">25 + 12.5 + 12.5</gadget>
<output>50</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<result>100</result>