A workshop plans to process 600 machine parts. (1/5) of the total number is completed on the first day, and (1/4) of the total number is completed on the first day. How many more machine parts are completed on the second day than on the first day?
一个车间计划加工600个机器零件，第一天完成总数的(1/5)，第一天完成总数的(1/4)，第二天比第一天多完成多少个机器零件？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">600 * (1/20)</gadget>
<output>30</output>

<result>30</result>