The length of an avenue is 20 meters, and a potted flower is placed every 4 meters from one end to the other on both sides of the road. How many potted flowers should be placed in total.
一条林阴道的长是20米，在这条道路两旁的这一头到那一头每隔4米放一盆花，一共要放多少盆花．
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>