piece of wood with a length of 3 meters is sawed into 3 sections, and the surface area is increased by 18 square decimeters. What is the volume of this piece of wood?
一根长3米的木料锯成3段，表面积增加了18平方分米，原来这根木料的体积是多少？
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">18 / 4</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">(9/2) * 3 * 10</gadget>
<output>135</output>

<result>135</result>