Master Zhang plans to process a batch of parts, 180 have been processed, and 40% are left unprocessed. How many parts are there in total?
张师傅计划加工一批零件，已经加工180个，还剩40%没有加工，这批零件一共多少个？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">180 / (3/5)</gadget>
<output>300</output>

<result>300</result>