Master Li makes a cuboid frame with a length of 6dm, a width of 5dm, and a height of 4dm, at least how many dm of iron wire is needed.
李师傅做一个长6dm，宽5dm，高4dm的长方体框架，至少需要铁丝多少dm．
<gadget id="calculator">6 + 5 + 4</gadget>
<output>15</output>

<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<result>60</result>