A tourist walks on the road at an equal speed. It takes him 11 seconds to walk from the first tree to the tenth tree (the distance between every two trees is equal), how many trees should he walk to in 22 seconds? ．
一位游人以相等的速度在马路上散步，他从第1棵树走到第10棵树用了11秒，(每两棵树之间的距离相等)，22秒应该走到第多少棵树．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">11 / 9</gadget>
<output>11/9 = around 1.222222</output>

<gadget id="calculator">22 / (11/9)</gadget>
<output>18</output>

<gadget id="calculator">18 + 1</gadget>
<output>19</output>

<result>19</result>