A batch of parts has been completed (1/3), and 400 more parts will be completed (5/6). How many parts are there in total?
一批零件已经完成了(1/3)，再做400件就完成(5/6)，这批零件共多少件？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(5/6) - (1/3)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">400 / (1/2)</gadget>
<output>800</output>

<result>800</result>