There is a row of willow trees by the lake, and the distance between every two trees is 6 meters. How many meters does Xiao Ming run from the first tree to the 20th tree?
湖边有一排柳树，每两棵树之间相距6米，小明从第1棵树跑到第20棵树，共跑多少米．
<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<gadget id="calculator">19 * 6</gadget>
<output>114</output>

<result>114</result>