Processing a batch of parts, A alone can complete the task in 2 days (1/5), B alone can complete it in 20 days, when A and B work together, A makes 1000 parts, how many parts are there in total?
加工一批零件，甲独做2天能完成任务的(1/5)，乙独做20天完成，甲、乙合做完成时，甲做了1000个零件，这批零件共有多少个？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) / 2</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/10) / (1/20)</gadget>
<output>2</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1_000 * (1/2)</gadget>
<output>500</output>

<gadget id="calculator">500 + 1_000</gadget>
<output>1_500</output>

<result>1_500</result>