The width and height of a cuboid are both 5cm. After cutting it into two equal cuboids from the midpoint of the length, the surface area of one of the cuboids obtained is 100cm**2 less than the surface area of the original cuboid. What is the length of the original cuboid? centimeter?
一个长方体的宽和高都是5cm，把它从长的中点截成两个相等的长方体后，得到的其中一个长方体的表面积比原来长方体的表面积减少100cm**2，原来长方体的长是多少厘米？
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">100 / 20</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>