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Answers to the 80-page question of "Full Practice of Primary School Textbooks" in the second volume of sixth grade mathematics published by People's Education Press.
The total number of books is unchanged and set to "1".
When allocating, the small army is assigned to 5/(5+4)=5/9 of the total.
He has finished more than 20% of the original assigned tasks, that is, he has finished.