Place flowerpots on both sides of a corridor. This corridor is 24 meters long. Place a potted flower every 3 meters from one end of the corridor. How many potted flowers should be placed in total?
在一条走廊的两边摆花盆，这条走廊长24米，从走廊的一端每隔3米摆一盆花，一共要摆多少盆花．
<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>