In order to welcome Children's Day, the school plans to place flowers on both sides of the road 60 meters in front of the teaching building (the end close to the wall is not placed), and the distance between two adjacent potted flowers is 3 meters. How many pots of flowers are needed in total?
为迎接六一儿童节，学校准备在教学楼前60米的道路两旁摆放鲜花(靠墙一端不放)，相邻两盆花之间的距离是3米．一共需要几盆花？
<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<result>40</result>