A wire can form a cuboid with a length of 6dm, a width of 5dm and a height of 4dm. If a cube is surrounded by this wire, what is the length of the sides of the cube in dm?
一根铁丝可以围成一个长6dm，宽5dm，高4dm的长方体．如果用这根铁丝围成一个正方体，那么这个正方体的棱长是多少dm？
<gadget id="calculator">6 + 5 + 4</gadget>
<output>15</output>

<gadget id="calculator">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">15 * (1/3)</gadget>
<output>5</output>

<result>5</result>