The sum of the lengths of a cuboid and a cube are equal. The length, width, and height of a cuboid are 6 decimeters, 5 decimeters, and 4 decimeters, so how many decimeters are the side lengths of the cube, and are their volumes equal?
一个长方体和一个正方体的长总和相等．长方体的长宽高分别是6分米，5分米，4分米，那么正方体的棱长是多少分米，它们的体积相等吗？
<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>