Plant trees on both sides of a road with a length of 50m, plant one tree every 10m, and plant at both ends. How many trees are there on this road?
在一条长50m的公路两边种树，每隔10m种1棵，两端都种，这条路上共有多少棵树？
<gadget id="calculator">50 / 10</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>