There is a 60-meter-long path in the school, and it is planned to plant trees on the side of the path. Plant one tree every 3 meters. If one tree is planted at each end, how many saplings should be planted in total?
学校有一条长60米的小道，计划在道路一侧种树．每隔3米栽一棵，如果两端都各栽一棵树，那么共需栽多少棵树苗．
<gadget id="calculator">60 / 3</gadget>
<output>20</output>

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

<result>21</result>