The master and apprentice worked together to process a batch of parts, and distributed them to the master and apprentice according to the ratio of 7:5. As a result, the master processed 308 parts, 10% of the task was overfulfilled. How many pieces does the apprentice actually process?
师徒两人合作加工一批零件，按7：5分配给师徒，结果师傅加工了308个零件，超额完成任务的10%．徒弟实际加工多少个？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">308 / (11/10)</gadget>
<output>280</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">280 * (5/7)</gadget>
<output>200</output>

<gadget id="calculator">280 * (1/10)</gadget>
<output>28</output>

<gadget id="calculator">200 - 28</gadget>
<output>172</output>

<result>172</result>