The qualified rate of a batch of parts is 95%. If 380 parts in this batch are qualified, how many parts are there in total?
一批零件的合格率是95%，如果这批零件中有380个合格，则这批零件共有多少个．
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">380 / (19/20)</gadget>
<output>400</output>

<result>400</result>