A rectangular garden is 30 meters long and 25 meters wide. If this garden is surrounded by a fence, how long is the fence?
一个长方形花圃，长是30米，宽是25米．如果把这个花圃用篱笆围起来，篱笆长多少米？
<gadget id="calculator">30 + 25</gadget>
<output>55</output>

<gadget id="calculator">55 * 2</gadget>
<output>110</output>

<result>110</result>