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Engineering problems in junior high school mathematics
The sum of ergonomics of A, B and C is110.

The ergonomic sum of propafenone is 1/8.

The ergonomic sum of butyl acetate is 1/20.

The ergonomic sum of A and C is: (110+1/8-1/20) ÷ 2 = 7/80.

D work efficiency: 1/8-7/80=3/80.

It takes 1÷3/80=80/3 days to complete it alone.

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