Plant a row of trees between two buildings 100 meters apart, and plant one tree every 10 meters. How many trees are planted in total?
在相距100米的两楼之间栽一排树，每隔10米栽1棵，共栽几棵树？
<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<result>9</result>