There is an avenue on the bank of the river with a total length of 120 meters. Plant trees on one side of the avenue, plant both ends, and plant one tree every 8 meters. How many saplings are needed in total?
河岸边有一条大道，全长120米．在大道的一边栽树，两端都栽，每隔8米栽一棵，一共需要多少棵树苗？
<gadget id="calculator">120 / 8</gadget>
<output>15</output>

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

<result>16</result>