The road around the lake in Yinhu Villa is 4,500 meters long. Along the lake, a poplar tree is planted every 9 meters, and a bench is placed between every 3 poplar trees for tourists to rest. How many benches are needed in total?
银湖山庄环湖路长4500米，沿湖每隔9米种1棵杨树，每3棵杨树之间安放1条长椅供游人休息．一共需要安放多少条长椅？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">4_500 / 9 / 2</gadget>
<output>250</output>

<result>250</result>