A furniture factory wants to produce a batch of desks and chairs. 200 sets were completed in the first week, and (1/3) of the remaining tasks were completed in the second week. Only 400 sets were left to complete. How many sets of desks and chairs are there in total?
某家具厂要生产一批课桌椅．第一周完成200套，第二周完成余下任务的(1/3)，还差400套就全部完成．这批课桌椅一共多少套？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">400 / (2/3)</gadget>
<output>600</output>

<gadget id="calculator">600 + 200</gadget>
<output>800</output>

<result>800</result>