Obviously, to make a cube frame with a side length of 5 decimeters, he must prepare at least one iron bar of how many decimeters.
明明要做一个棱长是5分米的正方体框架，他至少要准备一根多少分米的铁条．
<gadget id="calculator">5 * 12</gadget>
<output>60</output>

<result>60</result>