The master and apprentice produced a total of 680 parts. The number of parts produced by the master was 20 times more than that of the apprentice. What fraction did the apprentice make as much as the master?
师徒两人一共生产了680个零件，师傅生产的零件个数比徒弟的2倍还多20个，徒弟所做的是师傅的几分之几？
<gadget id="calculator">680 - 20</gadget>
<output>660</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">660 / 3</gadget>
<output>220</output>

<gadget id="calculator">680 - 220</gadget>
<output>460</output>

<gadget id="calculator">220 / 460</gadget>
<output>11/23 = around 0.478261</output>

<result>11/23 = around 0.478261</result>