Two teaching buildings of a certain school are 144 meters apart, and a pine tree is planted every 12 meters between them. How many pine trees can be planted in total?
某校的两幢教学楼相距144米，在它们之间每隔12米种一棵松树．共可栽松树多少棵？
<gadget id="calculator">144 / 12</gadget>
<output>12</output>

<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<result>11</result>