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The final review paper is compiled in the sixth grade of mathematics primary school, p.39
Solution: Let the working efficiency of A be 5X, then the working efficiency of B is 4X.

The total work is 1.

1 divided by (1 divided by 5X+ 1 divided by 4X)=4.

You can find X= 1.8.

1.8 times 4=7.2, you can get the work efficiency of B.

Then B can complete 1 divided by 7.2 every day, which is 5/36 of this assignment.