The length of a rectangle is 24cm and its width is 8cm more than that. What is the perimeter of the rectangle?
一个长方形的长是24cm，比宽多8cm，这个长方形的周长是多少．
<gadget id="calculator">24 - 8</gadget>
<output>16</output>

<gadget id="calculator">24 + 16</gadget>
<output>40</output>

<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<result>80</result>