A rectangular garden is 27 meters long, and its width is 4 meters less than its length. A fence is to be planted around the garden. How long is the fence?
一个长方形花园，长27米，宽比长少4米，在这个花园的四周要种上篱笆，篱笆长多少米？
<gadget id="calculator">27 - 4</gadget>
<output>23</output>

<gadget id="calculator">27 + 23</gadget>
<output>50</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<result>100</result>