A cuboid block of wood is cut into two equal cubes. The sum of the sides of the two cubes is 40 cm longer than the sum of the sides of the original cuboid. What is the length of the original cuboid in centimeters?
一个长方体的木块，截成两个完全相等的正方体．两个正方体棱长之和比原来长方体棱长之和增加40厘米，求原长方体的长是多少厘米？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">40 / 8</gadget>
<output>5</output>

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

<result>10</result>