A 100-meter-long bridge, the master worker is going to install a street lamp every 10 meters on both sides of the bridge, and both ends must be installed, how many lights are needed in total?
一条长100米的桥，工人师傅准备在桥的两侧每隔10米安装一盏路灯，两端都要安装，共需要多少盏灯？
<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">11 * 2</gadget>
<output>22</output>

<result>22</result>