A project, Party A and Party B cooperate to complete in 8 days. Party A did it alone for 6 days, Party B did it alone for 5 days, a total of 27 / 40 of this project. If this project is done by Party A alone, how many days will it take to complete?

Party A did it alone for six days, Party B did it alone for five days, which can be regarded as five days of cooperation between Party A and Party B, and Party A did it alone for another day
Party A and Party B cooperate in 5 days
1/8×5＝5/8
One day
27/40－5/8＝1/20
If the project is done by Party A alone, it will be necessary to complete it
1 / 20 = 20 days

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