It takes 20 days for the two teams to work together on a project. The ratio of work efficiency of the two teams is 4:5. How many days does it take for the two teams to complete each project separately? You can't make equations, you have to explain and explain. Quick
A 45 days, B 36 days
4: The efficiency of 5 is 4 / 9 for a and 5 / 9 for B
In 20 days, a did 4 / 9, B did 5 / 9
Divide 20 by each person's share to calculate each person's individual time
For a project, team a and team B cooperate for 20 days. It is known that the work efficiency ratio of team a and team B is 4:5, and team a needs to complete the project alone______ Day
The sum of efficiency of Party A and Party B is 120, the work efficiency of Party A is 120 × 45 + 4 = 145, and the time required for Party A to complete the project alone is 1 △ 145 = 45 (days). Answer: it takes 45 days for Party A to complete the project alone
For a project, Party A and Party B cooperate to complete it in 12 days. If Party A does it alone in 20 days, what is the ratio of work efficiency between Party A and Party B
A efficiency = 1 / 20
The efficiency of team B is 1 / 12-1 / 20 = 1 / 30, that is, team B does it alone for 30 days
According to the inverse ratio of time ratio and efficiency ratio, the time ratio of team a and team B is 20:30 = 2:3
Then the efficiency ratio of team a and team B is 3:2
I wish you a happy new year,
3 / 4 tons can be regarded as 3 tons (), or 9 tons ()
The edge length ratio of the two cubes is 1 ∶ 3, and the surface area ratio of the two cubes is (): (), and the volume ratio is (): ()
For a project, team a and team B cooperate for 20 days. It is known that the work efficiency ratio of team a and team B is 4:5, and team a needs () days to complete the project alone
For a project, team a and team B cooperate for 20 days. It is known that the work efficiency ratio of team a and team B is 4:5, and team a needs (45) days to complete the project alone
3 / 4 tons can be regarded as 1 / 4 of 3 tons and 1 / 16 of 9 tons
The edge length ratio of the two cubes is 1 ∶ 3. The surface area ratio of the two cubes is (1) ∶ (9) and the volume ratio is (1) ∶ (27)
For a project, team a and team B cooperate for 20 days. It is known that the work efficiency ratio of team a and team B is 4:5, and team a needs (45) days to complete the project alone