The total length of a bridge is 155 meters. It is planned to install 16 patterns on the railings on both sides of the bridge. The horizontal length of each pattern is 5 meters. The patterns near both ends of the bridge are 15 meters away from the bridge head. How many meters apart?
一座桥全长155米，计划在桥的两侧栏杆上各安装16块花纹图案，每块图案的横长为5米，靠近桥两头的图案距桥头都是15米，那么相邻两块图案之间间隔多少米？
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">155 - 30</gadget>
<output>125</output>

<gadget id="calculator">5 * 16</gadget>
<output>80</output>

<gadget id="calculator">125 - 80</gadget>
<output>45</output>

<gadget id="calculator">45 / 15</gadget>
<output>3</output>

<result>3</result>