For a batch of parts, the ratio of the parts processed on the first day to the total number is 1:3, and 60 more parts are processed, which is exactly 60% of this batch of parts. How many parts are there in total?
一批零件，第一天加工的零件与总数的比是1：3，再加工60个，正好完成了这批零件的60%，这批零件共有多少个？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(3/5) - (1/3)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">60 / (4/15)</gadget>
<output>225</output>

<result>225</result>