2.56+1/9-1.56+8/9 For a batch of parts, first process 120 parts, and then process the remaining 40%. At this time, the number of processed parts is equal to the number of unprocessed parts. How many parts are there in this batch?

2.56+1/9-1.56+8/9
=2.56-1.56+(1/9+8/9)
=1+1
=2
120/(60%-40%)=600
600 + 120 = 720

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