Plant trees on both sides of a 200-meter-long path, planting one tree every 20 meters. How many trees will be planted in total?
在一条长200米的小路两旁植树，每20米栽一棵．一共需要栽多少棵树？
<gadget id="calculator">200 / 20</gadget>
<output>10</output>

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

<gadget id="calculator">11 * 2</gadget>
<output>22</output>

<result>22</result>