A rectangular swimming pool is 10 meters long and 8 meters wide. Mima walks around the swimming pool, how many meters does it take in total?
一个长方形的游泳池，长10米，宽8米．米玛围绕游泳池走一圈，一共要走多少米？
<gadget id="calculator">10 + 8</gadget>
<output>18</output>

<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<result>36</result>