Master Zhang processes a batch of parts, and has already processed 25% of this batch of parts. If 36 parts are processed again, the ratio of the number of processed parts to the number of unprocessed parts is 2:3. Take a guess: How many parts are there in this batch?
张师傅加工一批零件，已经加工了这批零件的25%，如果再加工36个零件，则已加工的零件个数与未加工的零件个数的比是2：3．猜一猜：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">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/5) - (1/4)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">36 / (3/20)</gadget>
<output>240</output>

<result>240</result>