The sum of the sides of a cuboid is 84 decimeters, and the ratio of length, width and height is 2:3:2. What is the volume of this cuboid?
一个长方体棱长和是84分米，长宽高的比是2：3：2，这个长方体的体积是多少．
<gadget id="calculator">84 / 4</gadget>
<output>21</output>

<gadget id="calculator">2 + 3 + 2</gadget>
<output>7</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">21 * (2/7)</gadget>
<output>6</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">21 * (3/7)</gadget>
<output>9</output>

<gadget id="calculator">6 * 6 * 9</gadget>
<output>324</output>

<result>324</result>