A batch of parts is divided into two days on average. The pass rate on the first day is 90%, and the pass rate on the second day is 95%. A total of 370 parts are passed in two days. How many parts are there in this batch?
一批零件平均分成两天做，第一天合格率是90%，第二天合格率是95%，两天共合格了370个，这批零件共多少个？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">(9/10) + (19/20)</gadget>
<output>37/20 = around 1.85</output>

<gadget id="calculator">(37/20) / 2</gadget>
<output>37/40 = around 0.925</output>

<gadget id="calculator">370 / (37/40)</gadget>
<output>400</output>

<result>400</result>