A cuboid, the sum of the lengths of the edges is 60 decimeters, and the width and height are both 3 decimeters, find its volume.
一个长方体，棱长总和是60分米，宽和高都是3分米，求它的体积．
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<gadget id="calculator">15 - 3 - 3</gadget>
<output>9</output>

<gadget id="calculator">9 * 3 * 3</gadget>
<output>81</output>

<result>81</result>