It takes 10 days for Party A to do a project alone and 15 days for Party B to do it alone. If two people cooperate, the work efficiency of Party A will be reduced by 20% and that of Party B will be reduced by 10%. Now it takes 8 days to complete this task. The number of days for two people to cooperate is as small as possible. How many days do two people have to cooperate?

It takes 10 days for Party A to do a project alone and 15 days for Party B to do it alone. If two people cooperate, the work efficiency of Party A will be reduced by 20% and that of Party B will be reduced by 10%. Now it takes 8 days to complete this task. The number of days for two people to cooperate is as small as possible. How many days do two people have to cooperate?

First, calculate the cooperation between Party A and Party B. the efficiency of Party A and Party B is 1 / 10,1 / 15 every day, and the cooperation efficiency is 0.1 * 0.8 + 1 / 15 * 0.9 = 7 / 50. If the cooperation is set for X days, it is guaranteed to be completed. If the rest is done by Party A alone, 7 / 50 * x + 1 / 10 * (8-x) = 1, then x = 5 is the answer,

For a project, it takes 12 days for Party A to complete. If the work efficiency of Party B is 20% higher than that of Party A, it takes () a.6 days b.8 days C.10 days d.11 days to complete the project

It takes 12 days for a to complete, 1 / 12 every day
If the work efficiency of Party B is 20% higher than that of Party A, then 1 / 12 * (1 + 0.2) = 0.1
So it takes 1 △ 0.1 = 10 days
c

If Party A can complete a certain work alone within 12 days, and Party B's work efficiency is 20% higher than that of Party A, then Party B can use it___ The work can be finished in ten days

Ten days

A project, a 12 days to complete, B work efficiency is 20% higher than a, B to complete the work to a few days, how equation

Let B finish in X days, and B's efficiency is 1 / x per day
1/x：1/12=（1+20%）
12/x=1.2
x=10