Master Li processes a batch of parts. The ratio of the number of completed parts to the total number of parts on the first day is 2:5. If 27 more parts are processed, (5/8) of this batch of parts can be completed. How many parts are there in this batch?
李师傅加工一批零件，第一天完成的个数与零件总个数的比是2：5，如果再加工27个，就可以完成这批零件的(5/8)．这批零件共有多少个？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

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

<gadget id="calculator">(5/8) - (2/5)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">72 / (9/40)</gadget>
<output>320</output>

<result>320</result>