The sum of the sides of a cuboid is 72 decimeters, and the ratio of length, width and height is 5:3:1. What is its volume in cubic decimeters?
一个长方体棱长的总和是72分米，长、宽、高的比是5：3：1，它的体积是多少立方分米．
<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<gadget id="calculator">5 + 3 + 1</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">18 * (5/9)</gadget>
<output>10</output>

<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

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

<gadget id="calculator">10 * 6 * 2</gadget>
<output>120</output>

<result>120</result>