Arbor Day is here. Trees should be planted along the roadside with a total length of 100 meters. The distance between two adjacent trees is 5 meters. How many saplings should be prepared in total.
植树节到了，要在全长100米的路旁植树，相邻两棵树的距离是5米．一共要准备多少棵树苗．
<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<gadget id="calculator">20 + 1</gadget>
<output>21</output>

<result>21</result>