Uncle Li’s house has a nursery next to the wall. The length and width are 12 meters and 10 meters respectively. If a bamboo fence is used to surround this rectangular nursery, how many meters of bamboo fence will be needed at least?
李大爷家有一块靠墙的苗圃，长和宽分别是12米和10米，如果用竹篱笆围这个长方形苗圃，至少需要多少米竹篱笆？
<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">12 + 20</gadget>
<output>32</output>

<result>32</result>