The school teaching building has 4 floors, and each floor has 5 classrooms. On average, 6 fluorescent lamps are installed in each classroom. How many fluorescent lamps are installed in the school?
学校教学楼有4层，每层5间教室，平均每间教室安装6盏日光灯，学校共安装多少盏日光灯．
<gadget id="calculator">6 * 5 * 4</gadget>
<output>120</output>

<result>120</result>