Master and apprentice cooperate to complete a batch of parts in (1/2) hour. At this time, the master makes 10 more parts than the apprentice. It is known that the work efficiency ratio of master and apprentice is 3:2. How many parts are there in this batch?
师徒合作一批零件，(1/2)小时完成，这时师傅比徒弟多做10个，已知师傅和徒弟的工作效率比是3：2，求这批零件有多少个？
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 / (1/5)</gadget>
<output>50</output>

<result>50</result>