There is a 60-meter-long road in the campus. Pine trees are planted on one side of the road, and one tree is planted every 4 meters. How many trees can be planted in total.
校园里有一段长60米的路，在路的一侧栽松树，每隔4米栽一棵，头尾都种一共可以栽多少棵．
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<gadget id="calculator">15 + 1</gadget>
<output>16</output>

<result>16</result>