The master and apprentice processed a total of 1680 parts and completed the task in 8 days. It is known that the apprentice processes 90 parts every day. How many parts does the master process every day?
师徒俩人共加工零件1680个，8天完成任务，已知徒弟每天加工90个零件，师傅每天加工多少个？
<gadget id="calculator">1_680 / 8</gadget>
<output>210</output>

<gadget id="calculator">210 - 90</gadget>
<output>120</output>

<result>120</result>