In a cuboid, the sum of length, width and height is 72 decimeters, and the ratio of length, width and height is 5:3:4. What is the volume of this cuboid?
一个长方体中，一组长、宽、高的总和是72分米，长、宽、高的比是5：3：4，这个长方体体积是多少？
<gadget id="calculator">5 + 3 + 4</gadget>
<output>12</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">72 * (5/12)</gadget>
<output>30</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">72 * (1/4)</gadget>
<output>18</output>

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

<gadget id="calculator">72 * (1/3)</gadget>
<output>24</output>

<gadget id="calculator">30 * 18 * 24</gadget>
<output>12_960</output>

<result>12_960</result>