In order to welcome teachers from other schools to give lectures, Mingde Primary School placed flower pots from the teaching building to the gate, with one pot every 3 meters (both ends), and a total of 24 pots were placed on both sides. How much rice.
明德小学为欢迎外校老师来校讲课，从教学楼到大门口摆放花盆，每隔3米放一盆(两头都摆)，两边共摆放了24盆，教学楼到大门口有多少米．
<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">11 * 3</gadget>
<output>33</output>

<result>33</result>