In the zoo, a colorful path needs to be built between two tiger mountains. The distance between the two tiger mountains is 400 meters, and a potted flower is placed on each side of the road every 10 meters (not at both ends). How many potted flowers should be placed in total? ?
动物园里要在两座虎山之间修一条彩色小路，两座虎山之间相距400米，每隔10米在路的两边各摆上一盆花(两端不摆)，一共要摆多少盆花？
<gadget id="calculator">400 / 10</gadget>
<output>40</output>

<gadget id="calculator">40 - 1</gadget>
<output>39</output>

<gadget id="calculator">39 * 2</gadget>
<output>78</output>

<result>78</result>