For a project, it takes 9 days for Party A to do it alone, and 12 days for Party B to do it alone. The work efficiency ratio of Party A and Party B is ()

1/9÷(1/12)=1/9×12=4:3

A project, team a alone to complete 9 days, team B alone to do 6 days
A project, team a alone to complete 9 days, team B alone to complete 6 days
How much does team a complete every day? How much does team B complete every day?
How many days does team a and team B work together to complete the whole project?
The two teams work together for three days to complete the whole project. If team a works for three days first and team B works for the rest, how many more days will it take to complete it?
How many days will it take for the remaining team B to finish if the two teams work together for half?
Thank you!

A 1 / 9 a day B 1 / 6 a day
Cooperation between Party A and Party B: 1 / 9 + 1 / 6 = 1 / 5 / 18 = 3.6 days
B (1-1 / 9x3) △ 1 / 6 = 2 / 3 △ 1 / 6 = 4 days
1 / 2 △ 1 / 6 = 3 days
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For a project, Party A works alone for 6 days and Party B works alone for 4 days. The work efficiency ratio of Party A and Party B is ()
A. 6:4B. 2:5C. 2:3

16: 14 = (16 × 12): (14 × 12) = 2:3

A project, B alone to do 6 days to complete, a and B work efficiency ratio is 2:3, I would like to ask a and B to complete this project

The work efficiency ratio of a and B is 2:3, so we can calculate how many days a needs to complete. Divide 1 / 6 by three and multiply by two to calculate 1 / 9 of a's daily completion of this project. Divide this project by their sum, that is, 1 / (1 / 6 + 1 / 9), and it will take 18 / 5 days for a and B to complete this project
My hands are tired,

For a project, it takes 9 days for Party A to do it alone, and 12 days for Party B to do it alone. The work efficiency ratio of Party A and Party B is ()