A straight road is 200 meters long, and a tree is planted every 4 meters from one end to the other. Now it is changed to plant a tree every 5 meters. How many trees can be left without transplanting.
一条直路长200米，从一端到另一端每隔4米栽一棵树，现在要改成每隔5米栽一棵树，有多少棵树可以不用移栽．
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">200 / 20</gadget>
<output>10</output>

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

<result>11</result>