The sum of the lengths of all sides of a cuboid is 72 cm, and the ratio of its length, width, and height is 5:4:3. What is its volume in cubic centimeters?
一个长方体所有棱长的和是72厘米，它的长、宽、高的比是5：4：3，它的体积是多少立方厘米．
<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<gadget id="calculator">5 + 4 + 3</gadget>
<output>12</output>

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

<gadget id="calculator">18 * (5/12)</gadget>
<output>15/2 = around 7.5</output>

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

<gadget id="calculator">18 * (1/3)</gadget>
<output>6</output>

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

<gadget id="calculator">18 * (1/4)</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">(15/2) * 6 * (9/2)</gadget>
<output>405/2 = around 202.5</output>

<result>405/2 = around 202.5</result>