On both sides of a 50-meter-long road, plant a tree every 5 meters (both ends must be planted), how many trees can be planted in total.
在一条长50米的大路两旁，每隔5米栽一棵树(两端都要栽)，一共可栽多少棵树．
<gadget id="calculator">50 / 5</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>