On both sides of the path in front of the school, a pot of chrysanthemums (both ends) was placed every 5 meters, and a total of 20 pots were placed from the beginning to the end. How many meters is this path?
在学校门前小路的两边，每隔5米放一盆菊花(两端都放)，从起点到终点一共放了20盆．这条小路长多少米？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

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

<gadget id="calculator">9 * 5</gadget>
<output>45</output>

<result>45</result>