Plant trees on one side of the road, plant a total of 20 trees, and the distance between every two adjacent trees is 5 meters. What is the distance in meters from the first tree to the last tree?
在路的一边植树，一共栽了20棵，每相邻两棵树之间的距离是5米．那么从第一棵到最后一棵之间的距离是多少米．
<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<gadget id="calculator">19 * 5</gadget>
<output>95</output>

<result>95</result>