There are 18 street lights on one side of the New Century Bridge (both ends of the bridge), and the distance between the two street lights is 10 meters. What is the total length of the New Century Bridge in meters?
新世纪大桥一边有18盏路灯(桥两端都有)，两盏路灯之间的距离是10米．新世纪大桥全长是多少米．
<gadget id="calculator">18 - 1</gadget>
<output>17</output>

<gadget id="calculator">17 * 10</gadget>
<output>170</output>

<result>170</result>