There is a 60-meter-long road from the entrance of Xiao Ming’s house to the side of the road. Xiao Ming wants to plant trees every 3 meters on the side of the road. He plans not to plant the door of the house. How many trees will be planted in total?
小明家门口到公路边有一条长60米，小明要在小路一旁每隔3米栽一棵树，计划家门口不栽，一共要栽多少棵树？
<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<result>20</result>