The sum of the side lengths of a cuboid and a cube is equal, and the length, width and height of the cuboid are 3 cm, 2 cm and 1 cm respectively, so what is the side length of the cube?
一个长方体和一个正方体的棱长之和相等，已知长方体的长、宽、高分别是3厘米、2厘米、1厘米，那么正方体的棱长是多少？
<gadget id="calculator">3 + 2 + 1</gadget>
<output>6</output>

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

<gadget id="calculator">6 * (1/3)</gadget>
<output>2</output>

<result>2</result>