The sum of the sides of a cuboid is 80 cm, and the height and width are 5 cm. What is its length in cm?
长方体的棱长之和是80厘米，高和宽是5厘米，它的长是多少厘米？
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">5 + 5</gadget>
<output>10</output>

<gadget id="calculator">20 - 10</gadget>
<output>10</output>

<result>10</result>