Divide a cuboid into three cubes with equal edge lengths, the surface area is increased by 100cm**2, find the volume of the original cuboid.
把一个长方体分成三个棱长相等的正方体，表面积增加了100cm**2，求原来长方体的体积．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">15 * 5 * 5</gadget>
<output>375</output>

<result>375</result>