A road is 135 meters long. It is necessary to carry trees on both sides of the road. The distance between every two trees is 9 meters (both ends must be carried). How many trees should be carried in total?
一条路长135米，要在路两边载上树，每两棵树之间相距9米(两端都要载)，一共要载多少棵树？
<gadget id="calculator">135 / 9</gadget>
<output>15</output>

<gadget id="calculator">15 + 1</gadget>
<output>16</output>

<gadget id="calculator">16 * 2</gadget>
<output>32</output>

<result>32</result>