The master and the apprentice process a batch of parts. The master processes 55 pieces per day, and the apprentice processes 10 fewer parts than the master every day. This batch of parts totals 600. How many days will it take for the two masters and apprentices to cooperate?
师徒二人加工一批零件，师傅每天加工55个，徒弟比师傅每天少加工10个，这批零件一共600个，师徒二人合作要几天完成？
<gadget id="calculator">55 - 10</gadget>
<output>45</output>

<gadget id="calculator">45 + 55</gadget>
<output>100</output>

<gadget id="calculator">600 / 100</gadget>
<output>6</output>

<result>6</result>