A total of 40 trees are planted on both sides of Weimin Road, and the distance between every two trees is 5 meters. How long is Weimin Road?
在为民路两侧共栽树40棵，每两棵树之间都相距5米，为民路有多长？
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 - 1</gadget>
<output>19</output>

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

<result>95</result>