Master Wang wants to process a batch of parts. If the work efficiency is increased by 20%, it can be completed 1 hour earlier than the original time. If the original work efficiency is processed 120 parts, and the work efficiency is increased by 25%, the work can be completed 40 minutes earlier. , How many parts are there in this batch processed by Master Wang?
王师傅要加工一批零件，如果把工作效率提高20%可以比原来时间提早1小时完成，如果先按原来的工作效率加工120个以后，再将工作效率提高25%，则可提前40分钟完成，王师傅加工的这批零件有多少个？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1 / (6/5)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / (1/6)</gadget>
<output>6</output>

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

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">1 / (5/4)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(2/3) / (1/5)</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">6 - (10/3)</gadget>
<output>8/3 = around 2.666667</output>

<gadget id="calculator">120 / (8/3)</gadget>
<output>45</output>

<gadget id="calculator">45 * 6</gadget>
<output>270</output>

<result>270</result>