Master Zhang processes a batch of parts, the ratio of processed parts to unprocessed parts is 2:3, if he processes 16 more parts, the ratio of processed parts to unprocessed parts is 2:1, find How many parts are there in this batch?
张师傅加工一批零件，已加工的个数和未加工的个数的比是2：3，如果再加工16个，已加工的个数和未加工的个数的比是2：1，求这批零件共有多少个？
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

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

<gadget id="calculator">(2/3) - (2/5)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">16 / (4/15)</gadget>
<output>60</output>

<result>60</result>