A rectangular lawn is 14 meters long and 10 meters wide. Lay a circle of pebbles around the lawn. How long is the pebble path at least?
一块长方形草坪长14米，宽10米．在草坪的四周铺上一圈小石子，小石子路至少长多少米？
<gadget id="calculator">14 + 10</gadget>
<output>24</output>

<gadget id="calculator">24 * 2</gadget>
<output>48</output>

<result>48</result>