There is a piece of cuboid wood with a length of 5 decimeters, a width of 4 decimeters, and a height of 3 decimeters. Process it into the largest cube. Find the utilization rate of this piece of wood.
有一块长方体木料，长5分米，宽4分米，高3分米，把它加工成最大的正方体，求这块木料的利用率．
<gadget id="calculator">3 * 5 * 4</gadget>
<output>60</output>

<gadget id="calculator">3 / 60</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">3 * 3 * (1/20)</gadget>
<output>9/20 = around 0.45</output>

<result>9/20 = around 0.45</result>