A 9-meter-long piece of wood is sawed into 3 sections on average, and the surface area increases by 0.4 square meters. What is the volume of each piece of wood?
把一根9米长的木料平均锯成3段，表面积增加了0.4平方米，每段木料的体积是多少．
<gadget id="calculator">0.4 / 4</gadget>
<output>0.1</output>

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

<gadget id="calculator">0.1 * 3</gadget>
<output>0.3</output>

<result>0.3</result>