A piece of cuboid wood with a square base is 5 meters long. If it is cut into 4 sections, the surface area will increase by 36 square meters. What is the volume of this cuboid wood?
一块底面是正方形的长方体木料，长5米，把它截成4段，表面积增加36平方米，这块长方体木料体积是多少？
<gadget id="calculator">36 / 6</gadget>
<output>6</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<result>30</result>