2000-meter-long highway is planted with poplar trees every 10 meters, and a maple tree is planted between every two poplar trees. How many maple trees are planted on both sides of this road?
一条长2000米的公路两旁每隔10米种一棵杨树，每两棵杨树之间栽1棵枫树．这条公路两旁一共种枫树多少棵．
<gadget id="calculator">2_000 / 10</gadget>
<output>200</output>

<gadget id="calculator">200 * 2</gadget>
<output>400</output>

<result>400</result>