There is a 900-meter path leading from the park to the small island in the middle of the lake. How many peach trees are needed to plant a peach tree every 15 meters on both sides of the path?
从公园通往湖心的小岛有一条900米的小路．在小路的两侧从头到尾每隔15米栽一棵桃树，需要多少棵桃树？
<gadget id="calculator">900 / 15</gadget>
<output>60</output>

<gadget id="calculator">60 + 1</gadget>
<output>61</output>

<gadget id="calculator">61 * 2</gadget>
<output>122</output>

<result>122</result>