For a project, it takes 8 days for team a to do it alone, and 10 days for team B to do it alone______ ．

The work efficiency ratio of a and B is: 18:110 = (18 × 40): (110 × 40) = 5:4

A project, team a alone to do 4 days to complete, team B alone to do 6 days to complete, then the ratio of a and B work efficiency is___

1/4:1/6=6:4=3:2

For a project, it is planned that Party A will do it for 4 days, and then Party B will do it for 10 days to complete the task,
In this way, team B finished the task in 7.5 days. How many days does it take for team a to do it alone?
Simple arithmetic "thank you"

Party A will do it for 4 days, and Party B will do it for another 10 days to complete the task
Party A does it for 6 days, and Party B does it for 7.5 days to complete the task
Therefore, the workload of Party A for 2 days = the workload of Party B for 2.5 days
Therefore, the workload of Party B for 10 days = that of Party A for 8 days
So it takes 8 + 4 = 12 days for a to complete alone

It takes 4 days for Party A to do the work alone, and 6 days for Party B to do it alone. If Party A does it for 1 day, then Party A and Party B complete the work together
How many days did a do it in total? Why do you do it

The efficiency of a is 1 / 4
B's efficiency is 1 / 6
The working efficiency of Party A and Party B cooperation is: 1 / 4 + 1 / 6 = 5 / 12
The amount of work a does alone in one day is 1 / 4
The rest of the work is: 1-1 / 4 = 3 / 4
The completion time of Party A and Party B's cooperation is: 3 / 4 (5 / 12) = 9 / 5 days
A total time: 1 + 9 / 5 = 14 / 5 days

For a project, it takes 8 days for team a to do it alone, and 10 days for team B to do it alone______ ．