One coil of wires is 48 meters long, and it takes 13.5 meters to install 9 lamps. According to this calculation, how many lamps can be installed on the remaining wires?
1盘电线长48米，安9盏灯用去13.5米，照这样计算，余下的电线可以安装多少盏灯？
<gadget id="calculator">48 - 13.5</gadget>
<output>34.5</output>

<gadget id="calculator">13.5 / 9</gadget>
<output>1.5</output>

<gadget id="calculator">34.5 / 1.5</gadget>
<output>23</output>

<result>23</result>