A corridor is 24 meters long, and a potted flower is placed every 3 meters, on both sides of the corridor (both ends must be placed). How many potted flowers are there in total?
一条走廊长24米，每隔3米放一盆花，走廊两侧都放(两端都要放)．一共要放多少盆花？
<gadget id="calculator">24 / 3</gadget>
<output>8</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>