100 square logs are piled up to form a cuboid with a length of 3 meters, a width of 40 decimeters, and a height of 2.5 meters. What is the average volume of each square log in cubic meters?
100根方木，堆成一个长3米，宽40分米，高2.5米的长方体．平均每根方木的体积是多少立方米．
<gadget id="calculator">40 / 10</gadget>
<output>4</output>

<gadget id="calculator">2.5 / 100</gadget>
<output>0.025</output>

<gadget id="calculator">3 * 4 * 0.025</gadget>
<output>0.3</output>

<result>0.3</result>