A cuboid is cut into three cubes, and the surface area increases by 100 square centimeters. What is the length of the original cuboid?
一个长方体被截成三个正方体，表面积增加了100平方厘米，原长方体的长是多少？
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>