Master Wang processed a batch of parts. On the first day, he processed (1/5), and on the second day, he processed 70 more. At this time, the ratio of processed parts to unprocessed parts is 3:5. How many parts are there in total? ?
王师傅加工一批零件，第一天加工了(1/5)，第二天又加工了70个，这时已加工的与未加工的个数比是3：5，这批零件一共多少个？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

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

<gadget id="calculator">(3/8) - (1/5)</gadget>
<output>7/40 = around 0.175</output>

<gadget id="calculator">70 / (7/40)</gadget>
<output>400</output>

<result>400</result>