Two people, A and B, inspect a batch of parts. After the inspection (4/5), there are still 52 parts left. How many parts are there in this batch?
甲乙两人检验一批零件，检验完(4/5)时，还剩52个．这批零件共有多少个？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">52 / (1/5)</gadget>
<output>260</output>

<result>260</result>