A section of the road is 80 meters long. It is planned to plant a tree every 10 meters on both sides of the road. How many trees should be planted on this section of the road?
一段路长80米，计划在路两旁每隔10米种一棵树，请问这段路要种多少棵树？
<gadget id="calculator">80 / 10</gadget>
<output>8</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>