A piece of cuboid wood with a length of 5 meters is cut into two sections along the cross section, and the surface area increases by 36 square decimeters. What is the volume of the original piece of cuboid wood?
一块长方体木料，长5米，沿横截面把它截成2段，表面积增加36平方分米，原来这块长方体木料体积是多少？
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">18 * 50</gadget>
<output>900</output>

<result>900</result>