A rectangular piece of land against a wall is 25 meters long and 15 meters wide. If you surround it with a fence, how many meters should it be at least?
一块靠墙的长方形的地，长25米，宽15米，如果给它周围围上篱笆，至少要多少米？
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">25 + 30</gadget>
<output>55</output>

<result>55</result>