A piece of cuboid wood with a square base and a length of 5 meters is cut into 4 sections, and the surface area increases by 3600 square decimeters. What is the volume of the original cuboid?
一块底面是正方形的长方体木条，长是5米，把它截成4段，表面积增加3600平方分米，原长方体木条的体积是多少？
<gadget id="calculator">3_600 / 100 / 6</gadget>
<output>6</output>

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

<result>30</result>