It takes 12 days for Master Wang to process 1920 parts alone, and 16 days for Master Li to complete it alone. How many parts does Master Li process less than Master Wang every day?
加工1920个零件，王师傅单独完成要12天，李师傅单独完成要16天，李师傅每天比王师傅少加工多少个零件？
<gadget id="calculator">1_920 / 12</gadget>
<output>160</output>

<gadget id="calculator">1_920 / 16</gadget>
<output>120</output>

<gadget id="calculator">160 - 120</gadget>
<output>40</output>

<result>40</result>