The sum of the lengths of the sides of a cuboid is 124cm, the height is 8cm, and the width is 5cm. What is the length of this cuboid?
长方体的棱长总和是124cm，高是8cm，宽是5cm，这个长方体的长是多少？
<gadget id="calculator">124 / 4</gadget>
<output>31</output>

<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<gadget id="calculator">31 - 13</gadget>
<output>18</output>

<result>18</result>