A corridor is 48 meters long, and potted flowers are placed every 3 meters, and the two ends of the corridor are not placed. How many potted flowers should be placed in total?
一条走廊长48米，每隔3米放一盆花，走廊的两端不放，一共要放多少盆花？
<gadget id="calculator">48 / 3</gadget>
<output>16</output>

<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<result>15</result>