The school wants to plant trees on the side of the 150-meter-long road in front of the teaching building, planting one tree every 5 meters (not planting at both ends), how many saplings are needed in total?
学校要在教学楼前150米长的路的一旁栽树，每隔5米栽一棵(两端不栽)，共需要多少棵树苗？
<gadget id="calculator">150 / 5</gadget>
<output>30</output>

<gadget id="calculator">30 - 1</gadget>
<output>29</output>

<result>29</result>