A corridor is 30 meters long, and a pot of plants is placed every 3 meters from one end of the corridor to the other end.
一条走廊长30米，从走廊的一端到另一端每隔3米放一盆植物，两端都摆，要放多少盆植物．
<gadget id="calculator">30 / 3</gadget>
<output>10</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<result>11</result>