Plant trees on both sides of an 80-meter-long road, plant one tree every 10 meters, and plant at both ends. How many saplings should be prepared?
在一条长80米的马路两旁植树，每隔10米种一棵，两端都种，要准备多少棵树苗．
<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>