On one side of a 20-meter-long straight road, put a potted flower every 2 meters. How many potted plants do you need if you put them at both ends?
在一条20米长的直道一边，每隔2米放一盆花．如果两端都放，需要多少盆花？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<result>11</result>