Cut a cuboid with a length of 40cm into cuboids with a length of 20cm, and the surface area increases by 10cm2. What is the volume of the original cuboid in cm**3.
把长为40cm的长方体截成每段长为20cm的长方体，表面积增加了10cm2，原来长方体的体积为多少cm**3．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 40</gadget>
<output>200</output>

<result>200</result>