Master Zhang processes 138 parts per hour, and Master Zhao processes 153 parts per hour. They work 8 hours a day. How many more parts does Master Zhao process than Master Zhang per day?
张师傅每小时加工138个零件，赵师傅每小时加工153个零件，他们每天工作8小时，赵师傅比张师傅每天多加工多少个零件？
<gadget id="calculator">153 - 138</gadget>
<output>15</output>

<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<result>120</result>