In a labor competition, Xiao Wang and Xiao Li each had to process the same batch of parts. They both started at the same time. When Xiao Wang processed half of his own parts, Xiao Li still had 40 parts to process. According to this workpiece efficiency, when Xiao Wang completes the task, Xiao Li processed (6/7) of the total number of his parts. How many parts should they each process?
一次劳动竞赛，小王和小李各自要加工同样多的一批零件，他们俩同时开始，当小王加工了自己零件总数的一半时，小李还有40个零件没有加工．照这样的工件效率，当小王完成任务时，小李加工了自己零件总数的(6/7)，他们各自应加工多少个零件？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

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

<gadget id="calculator">(6/7) * (1/2)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">40 / (4/7)</gadget>
<output>70</output>

<result>70</result>