Process a batch of parts, process all (2/15) on the first day, and process 6 less than the second day. The ratio of the number of processed parts to the number of unprocessed parts in the two days is 2:3. How many parts are there in this batch? indivual?
加工一批零件，第一天加工全部的(2/15)，比第二天少加工6个，两天共加工的个数与未加工的个数比是2：3，这批零件共有多少个？
<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 / 15</gadget>
<output>2/15 = around 0.133333</output>

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

<gadget id="calculator">(2/5) - (4/15)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">6 / (2/15)</gadget>
<output>45</output>

<result>45</result>