A cuboid with a square base and a length of 7m is cut into 4 sections, and the surface area increases by 36 square meters. What is the volume of this cuboid?
一块底面是正方形的长方体木条，长7m，把它截成4段，表面积增加36㎡，这块长方体木条体积是多少？
<gadget id="calculator">36 / 6</gadget>
<output>6</output>

<gadget id="calculator">6 * 7</gadget>
<output>42</output>

<result>42</result>