设师傅加工x个零件

5

8

x-（840-x）×

2

3

=60
    

5

8

x-560+

2

3

x=60
   

31

24

x-560+560=60+560
       

31

24

x÷

31

24

=620÷

31

24

              x=480
840-480=360（个）
答：师傅加工了480个零件，徒弟加工了360个零件．