A piece of flower seedling against the wall is 9 meters long and 5 meters wide. If you want to surround him with a fence, how many meters of fence do you need at least?
一块靠墙花苗，长有9米，宽5米，现要给他围上篱笆，至少需要多少米的篱笆呢？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">9 + 10</gadget>
<output>19</output>

<result>19</result>